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Heart for Science and Technology Studies Centre for Science and Technology Studies 2333AL Leiden Zuid Holland 31715273909 https://www.vosviewer.com/
Getting Started
To become started with VOSviewer, you may want to take a look at some of the sources of information listed beneath.
Video
VOSviewer manual
The VOSviewer manual provides detailed and up-to-date information on the functionality of VOSviewer. The manual can as well be accessed using the Manual button in VOSviewer.
Open VOSviewer manual
VOSviewer book affiliate
VOSviewer is discussed in detail in a recent book chapter. The chapter provides a tutorial in which the apply of VOSviewer is demonstrated in a step-by-step way. The affiliate is based on VOSviewer version 1.5.5. Some of the improvements and extensions introduced in the most recent versions of VOSviewer are therefore non covered in the chapter. In improver to VOSviewer, the chapter also discusses the CitNetExplorer tool for visualizing and analyzing citation networks of publications.
Open up VOSviewer book chapter
VOSviewer paper
VOSviewer was originally introduced in a paper published in Scientometrics in 2010. In the meantime, VOSviewer has been improved and extended in many ways, and then the newspaper is not fully upward-to-date anymore. Even so, it even so provides a useful introduction into the main ideas underlying VOSviewer.
Open VOSviewer paper
AIDA booklet
The AIDA booklet introduces diverse case studies on research positioning and tendency identification. These instance studies are relevant for PhD candidates, researchers, group leaders, and policy makers. Many of the example studies brand use of VOSviewer.
Open AIDA booklet
Comments
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Sudarsan May 13th, 2022 eight:23 pm Practiced to get familiar with Vos viewer
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- Catherine May 13th, 2022 one:08 pm
Hello, once more.
I've been using thesaurus files containing labels that are not replaced by anything (and so the labels are excluded) and labels that are replaced with other terms (for instance, key enabling applied science would be replaced by technology). I noticed that this results in substantially different identified noun phrases than if I were to not use a thesaurus file. In this example, is it recommended to use a thesaurus file with the style that I've been using it (is this making VOSviewer more effective in identifying relevant noun phrases?), or is it best to employ it sparingly and only to replace words with some other term?
Thank you.Respond
- Ludo Waltman May 14th, 2022 2:44 pm
I tend to minimize the utilise of a thesaurus file. Creating such a file may take a substantial corporeality of time and often does not significantly bear on my interpretation of a term map. While the use of a thesaurus file may significantly affect the details of a term map, in my experience the high-level picture unremarkably doesn't change much, and my advice typically is to focus the interpretation of a term map on the loftier-level picture, not on the details.
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- Catherine May 13th, 2022 12:06 pm
Howdy,
In the Van Eck and Waltman (2011) paper, what does "distributon of (second-order) co-occurrences mean? Also, what would be the cutting-off score between high and low relevance scores? For case, if I have relevance scores betwixt 0.01 and 2.16, would loftier relevance scores be those in a higher place 1.00?
Give thanks you lot.Answer
- Ludo Waltman May 14th, 2022 2:25 pm
I'1000 afraid we don't take proper documentation of the algorithm for calculating relevance scores, so it's difficult to explain the details on the algorithm. There's no specific threshold for determining what should be considered a high relevance score. This is up to the user to decide, and it may depend on the purpose of your analysis and the data set you're working with.
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- Sristhi May 11th, 2022 4:03 pm
Hullo,
i take two queries:
i) Why vos viewer doesn't evidence all the labels on the map? Is there a mode to deal with this?
2) How does vos viewer identifies countries of the publications? Is it the land where the authors belong? or is information technology the land where the article is published?
3) Does vos viewer allows us to remove the logo of vos viewer from the visualization map?
I would exist grateful if someone could help with this.Reply
- Ludo Waltman May 14th, 2022 2:34 pm
i) This is because at that place oft is not enough space to show all labels. VOSviewer so gives priority to the labels of items with higher weights over the labels of items with lower weights. Y'all could effort switching from 'Circles' to 'Frames' if yous want to see more labels.
2) It is the country mentioned in the amalgamation of an author every bit reported in an commodity.
3) In that location is no option in VOSviewer to remove the logo, only you can try to manually remove it past editing a screenshot of a VOSviewer visualization in an image editor.Reply
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- nurit Rozolyo May 11th, 2022 eleven:05 am
why don't you answer me????????????????
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- nurit Rozolyo May 8th, 2022 10:36 am
there are difficulties in sharing some of the maps, and I tin't empathize why it share ane and not the other....
for exam:
https://tinyurl.com/y3faey3g- the link can be shared.
https://tinyurl.com/yxq6xl63- the link can't be shared!
I'll appreciate whatever clarification...Respond
- Ludo Waltman May 14th, 2022 eight:26 pm
Apologies for the deadening response. It took some time to investigate your problem. In that location turns out to be a bug in VOSviewer Online. The issues has to practice with the apply of double quotation marks in JSON files.
Thanks for bringing this issue to our attention! It will exist stock-still in the next update of the software.Answer
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- Catherine May 7th, 2022 11:43 am
Hullo. I am following upward on my questions: i) While "and" is not included in the noun phrases, "&" is included. I'k wondering why that may be? two) I was trying to send a previous message several times as information technology kept proverb the verification expired until I got a bulletin saying that my IP was banned due to suspicious activeness. I couldn't access the website afterwards that. I am now on a dissimilar IP and when I went to this webpage, I saw that my message had already gone through. Is at that place a fashion to clear the ban? 3) Just a notation that it doesn't seem like all plural noun phrases are converted to singular. For example, "key enabling technologies" and "key enabling technology" are both in the "Verify selected terms" section of "Create map". 4) The �Share� icon doesn�t show up for me on VOSviewer Online. I�ve tried it on Chrome, Edge, and Firefox. Is there a reason I'm not allowed to share? 5) In the thesaurus file, what are the potential consequences, if any, if several terms, identified from unlike documents, are replaced by 1 term? For example, if the labels �co evolution� (from document 1), �evolutionary function� (from certificate 2), �cities evolf� (from document ii), and �long term development� (from certificate iii) are replaced past �evolution�, will VOSviewer and then show �evolution� coming from 3 documents (for binary counting)? And how will this affect the relevance score and the clustering? Thank you!
Answer
- Ludo Waltman May 8th, 2022 eight:58 am
In exceptional cases the plural to singular conversion may fail. You can then use a thesaurus file to perform the conversion.
In your example, when you employ the thesaurus file, VOSviewer will indeed consider the term 'evolution' to occur in each of the 3 documents, leading to iii occurrences of this term in the instance of binary counting. The results of the adjacent steps in the analysis, such as the calculation of relevance scores and the clustering, will be identical to the results that would accept been obtained if the term 'evolution' had occurred in each of the three documents and no thesaurus file had been used.
In VOSviewer Online, the 'Share' button appears but when yous utilize VOSviewer Online to view a visualization that is already available online. It won't appear when y'all apply VOSviewer Online to view a visualization that is stored locally on your figurer.Reply
- Catherine May 8th, 2022 12:forty pm
Thank you lot!
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- Therese Tikkanen May 2nd, 2022 11:eleven am
Hi! I'1000 currently using VOSviewer in my thesis and I stumbled upon a question marking. In the analysis tab I've experimented with the clustering and I tin can't choose if I should change the min. cluster size or the resolution to get my desired corporeality of clusters (around nine, to better view and describe the clusters). I'm not certain if my desired corporeality of clusters is a question of detail or simplicity. Does anyone have any communication in which of these modifications are improve to employ?
Co-citation map based on min. cluster size (9 clusters): https://tinyurl.com/y5fjcvhr
Same map based on resolution (9 clusters): https://tinyurl.com/y6e6zdv6
There is a difference merely I can't tell what the divergence is or what information technology means, if that makes sense. Whatsoever help would exist greatly appriceated!Reply
- Therese Tikkanen May 2nd, 2022 eleven:27 am
I just saw the first map has 6 clusters and not 9, excuse my defoliation. I'thou still curious regarding the pick between resolution and min. cluster size though!
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- Ludo Waltman May 2nd, 2022 12:02 pm
My advice is to rely primarily on the resolution parameter and to utilize the minimum cluster size parameter simply to get rid of very small clusters (e.g., containing fewer than v items). Furthermore, my advice is to cull the parameter values in such a way that you obtain a level of granularity that fits well with the question you want to answer. For some questions you may demand a high level of granularity (i.eastward., a relatively large number of clusters), while for other questions a low level of granularity (i.eastward., a relatively small number of clusters) may be more suitable.
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- × ×•×¨×™×ª רוזוליו April 29th, 2022 4:40 pm
in that location are difficulties in sharing some of the maps, and I tin can't empathise why it share one and non the other....
for test:
https://tinyurl.com/y3faey3g- the link can be shared.
https://tinyurl.com/yxq6xl63- the link can't be shared!
I'll capeesh any description...
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- nurit rozolyo May second, 2022 12:14 pm
can yous please answer me?
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- Carolina Contreras April 28th, 2022 iii:xxx am
Hello!
Can I choose how many clusters to have? Thank you!Reply
- Ludo Waltman April 28th, 2022 8:00 am
You cannot direct choose the number of clusters, simply you tin influence the number of clusters by changing the resolution parameter on the 'Assay' tab. The higher the value of this parameter, the larger the number of clusters that you lot will get. The default value is 1.0. Typical values are between 0.5 and 2.0.
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- Faza Fawzan Bastarianto April 25th, 2022 1:xviii pm
Hi, I am trying to open VosViewer through my MacOs. However, it failed to open every time I tried to open information technology as there was an fault message "Unable to load Coffee Runtime Environment". Currently, I accept installed java version "11.0.13" 2021-x-19 LTS on my Mac.
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- Faza Fawzan Bastarianto April 28th, 2022 eight:31 pm
Hullo, can someone respond to my inquiry above? thanks
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- Farida April 29th, 2022 3:05 pm
I had the same problem when installing you merely have to download java on your mac then endeavour opening VOSviewer again and it should work fine.
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- Jennifer Sharkey April 22nd, 2022 two:36 am
Love VOSviewer and I'one thousand currently using information technology in my PhD. Is there a mode to relieve the cluster groupings into a txt file (every bit the keywords can be?) Cheers
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- Ludo Waltman Apr 22nd, 2022 10:25 pm
You lot can salve your map in a VOSviewer map file (using the 'Salve' button on the 'File' tab) and so open this file in a spreadsheet program. Cluster information can then exist found in the 'cluster' column.
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- Jennifer Sharkey April 23rd, 2022 one:13 am
Vivid cheers
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- van anh Apr 20th, 2022 11:28 am
Thanks so much
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- Nick April 19th, 2022 ix:27 am
Hi!
Firstly, just want to say that the plan is great and very easy to use!
I want to check if one) I'm manipulating a RIS file by replacing the Abstruse cavalcade with keywords of the commodity instead of abstracts and two) apply the "title and abstruse" choice in VOSViewer for text file for RIS, will this work normally or is the algorithm for visualizing championship and abstruse unlike from what would exist used to visualize keywords.
Thank you!
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- Ludo Waltman April 23rd, 2022 2:50 pm
My communication is non to take this approach. At that place is no guarantee that the algorithm used by VOSviewer for extracting terms from abstracts will correctly identify your keywords (although in nearly cases information technology probably volition). Instead, my advice is to add your keywords in a keywords field (denoted by 'KW') in your RIS file and to apply the option for creating a keyword co-occurrence map (rather than a term co-occurrence map) in VOSviewer.
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- Erie Riza Nugraha April 16th, 2022 5:41 am
proficient task...!
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- Rumiana Koynova April 15th, 2022 eleven:29 pm
Is it possible to use the online version for the initial creation of the network and map files? Or you demand the installed version for that, and apply the online version for farther modification of the visualization?
Thanks!Reply
- Ludo Waltman April 16th, 2022 8:xviii am
You demand the stand-alone version of VOSviewer to create a map and network file. VOSviewer Online can be used to present a visualization based on a map and network file, but information technology cannot exist used to create these files.
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- Brady Boettcher April 16th, 2022 9:33 pm
I've seen mentions of the ability to generate map and network files from the command line using VOSviewer, but can't find this mentioned in the manual. Is this possible?
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- Brady Boettcher April 16th, 2022 10:35 pm
Specifically, creating maps and networks from the command line with data from JSON from an API, such as CrossRef. Similar to how Dimensions dynamically creates networks on its web platform.
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- Ludo Waltman April 16th, 2022 11:21 pm
The JSON file format used by VOSviewer is documented here: https://app.vosviewer.com/docs/file-types/json-file-type/. Apply the 'json' parameter to create a network from the command line based on data from a JSON file. See Section five.ane in the VOSviewer manual.
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- Brady Boettcher April 17th, 2022 ii:02 am
Thanks for the response! For the JSON method, is it possible to have VOSviewer calculate the links, scores and positions of the items automatically similar it does when using the GUI, or does the developer have to exercise this themselves?
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- Ludo Waltman April 17th, 2022 7:55 am
You need to provide the links, and optionally also the scores, equally input. VOSviewer is able to summate the positions (as well as the clusters) based on the links.
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- Ai F Apr 12th, 2022 two:54 am
Thanks for your worthy system. I accept a question.
If nosotros create a new map of the co-occurrence of terms using the text data in the bibliographic database files, how can we obtain the correspondance betwixt the �document IDs� listed in the file of �Document-Term Relations.txt� and the bibliographic information of the manufactures (e.g. PMID, etc.) ?
Similarly, if I create a new map for the citation of documents using the bibliographic data in the bibliographic database files, could I obtain like the correspondence table of certificate IDs and PMID?Reply
- Ludo Waltman April 12th, 2022 seven:34 am
The document with ID 1 corresponds with the first certificate in your bibliographic database file, the document with ID 2 corresponds with the second document in your bibliographic database file, and so on.
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- Ai F Apr 13th, 2022 3:47 am
Thank you. I understand. Allow me ostend one more than point.
If the PubMed data is dissever into multiple files, is it right that the IDs correspond, in order, first document, second document, ..., and last document in file 1, starting time document, second certificate, ..., and last certificate in file 2, and so on? Are the files read in ascending gild past file name?
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- Ali Rhouma Apr 10th, 2022 3:23 pm
Beloved Sor,
I accept a listing of journals published by funded projects and I wanna drew a map of who is working with who (co-publications between countries for instance) and as well the main keywords. Can the software use a table generated by our local platform?
Thanks for your helpReply
- Ludo Waltman April 10th, 2022 5:34 pm
Y'all could effort to catechumen your data to the format of a VOSviewer map file and a VOSviewer network file. These files types are described in the VOSviewer manual.
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- Faza Fawzan Bastarianto April 5th, 2022 12:52 pm
How-do-you-do, I am trying to open VosViewer through my MacOs. However, it was failed to open up every fourth dimension I tried to open up it as at that place was an error message "Unable to load Java Runtime Environment". Currently, I accept installed java version "11.0.13" 2021-10-xix LTS on my Mac.
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- ARUN SAXENA Apr 5th, 2022 4:45 am
Hi Ludo.
Adieu to you. Could you please help with a link to a skilful example written report that demonstrates estimation of keyword Co-occurrence and thematic analysis in keen item with the help of an example.
Thx.Reply
- LIU CAI Apr fifth, 2022 four:38 am
Howdy!
I'm having a wierd issue using VOS, 1.vi.18, the windows version. When I open information technology and try to upload the files, the pagese get stuck as I motion the mouse. For case, the "Ok" button and the "Adjacent" push button disappear, or announced on top of each other, or the file upload box show repeatly on i folio, or the content get completely bare on one page.
I really appreciate it if y'all can help me with it.Reply
- Daniela Valenzuela April fourth, 2022 half-dozen:thirteen pm
Hi, I am receiving the following error:
Fault while reading Lens file: Cannot discover author/south, Keywords, MeSH Terms or References field.
I am downloading data from Lens.org in CSV format. Whatsoever assistance? Thank y'all in advance.Reply
- Catherine April tertiary, 2022 three:23 pm
Howdy,
I am uploading a text file with excerpts from each document in each line. And so i don't move on to the adjacent line unless it'southward an extract from another certificate. I understand that by doing and so, the program will read each line as a new source/document.
I now only want to clarify the departure between full and binary counting.
For binary, the manual states, "the Occurrences attribute indicates the number of documents in which a term occurs at least once". Does this hateful that if nosotros opt to choose terms that occur at least twice, the programme would then find terms that occur in at least 2 documents (or lines)? Or does the program find terms that occur at least twice in a certificate?
For full, the manual states "the total number of occurrences of a term in all documents". Does this hateful that if we opt to cull terms that occur at to the lowest degree twice, the program would then observe terms that occur at least twice in the unabridged text file (regardless of whether or not a document/line contains the word)? Or does the program notice terms that occur at least twice in a document?
Thanks.Respond
- Ludo Waltman April 3rd, 2022 6:16 pm
In the case of binary counting, VOSviewer will select all terms that occur in at least two documents (regardless of the number of times they occur in these documents). In the case of total counting, VOSviewer will select all terms that occur at least twice in the corpus, either in two different documents or two times in the aforementioned document.
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- Catherine April 4th, 2022 three:04 am
Thanks very much for your quick response! To further analyze, for binary counting: if we opt for 1 occurrence, and so does the line between 2 terms demonstrate that they both occur in at to the lowest degree the same judgement in a document? And if we opt for ii occurrences, so does the line between two terms demonstrate that they both occur in at least the same sentence in a document or does it mean at least two same documents? Furthermore, the thicker the line the more frequent that both terms appear together? Thank you lot.
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- Ludo Waltman Apr 4th, 2022 7:15 am
Co-occurrences of terms are identified at the document level, not at the sentence level. A link between 2 terms therefore indicates that the terms occur together in at least 1 certificate, but not necessarily in the same sentence. Indeed, the thicker the line, the larger the number of co-occurrences of two terms.
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- Catherine April 4th, 2022 seven:13 pm
I see. Then, for binary counting, if I opt for a minimum of two occurrences, would I exist correct and so in saying the following statements: "VOSviewer will select all terms that occur in at to the lowest degree two documents (regardless of the number of times they occur in these documents)". The more prominent a term is on the map, the more documents this term occurs in. In terms of co-occurrences, if a term is linked to another term on the map, it means that, individually, both terms occur in at to the lowest degree 2 documents (not necessarily the same documents), only they co-occur in at to the lowest degree ane document and, the more prominent the link, the more than documents they both occur in.
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- Catherine April 5th, 2022 5:51 pm
In add-on to my last question I also have the following questions. (1) i uploaded a corpus file into VOSviewer with text from just one document. i made certain that all the text are in just one line (i employ Notepad++ which shows you each line that is in use). In this instance, for binary counting, obviously the but occurrence is 1. Each identified term also had a relevance score of ane.00. After generating the map, I noticed that non all terms link to all the other terms. Shouldn't they all link to each other given that they are all from the same document and VOSviewer identifies co-occurrences at the document level? (two) For the thesaurus file: a term in the label column must be a noun phrase (i.eastward., without a preposition) simply it can exist replaced by a term with a preposition? So, for instance, I cannot replace "quality of life" with "QoL", only I can supervene upon "QoL" with "quality of life"? This means that for terms such as "quality of life" and "research and development" i would accept to replace them in the corpus file with noun phrases or abbreviations (such as QoL and RD) so that they show up in the map? (3) Is there a faster way to obtain a list of terms that VOSviewer identifies with a minimum of 1 occurrence without saving the map.txt file? I noticed that at that place are long noun phrases that I don't need, but they have brusk noun phrases that I exercise need. For instance, VOSviewer identifies "artifical neural network", but i only want "network". I have it then that I would have to use the thesaurus file to supercede "artifical neural network" with "network"? If and then, is at that place a way to populate the list of terms so that I can just copy them into my thesaurus file and add the "replace by" terms for the labels that I do need, without having to generate the map in the first place? Thanks for your time in responding to our queries!
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- Catherine April tenth, 2022 12:59 am
Hello, I just want to say that I actually discovered the answer to my third question. In the "Verify selected terms" section of the "Create map" option, if y'all right click on a term, a pop-up menu gives y'all the choice to export the selected terms.
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- Ludo Waltman April 10th, 2022 1:35 pm
(1) Yes, they should indeed all link to each other. Perhaps the number of links in your map exceeds the maximum number of links shown by VOSviewer? By default, VOSviewer shows a maximum of chiliad links.
(2) No, I'chiliad afraid this is not possible. Prepositions will exist ignored, also when you employ a thesaurus file.
(3) Skilful to hear you managed to find an answer!Answer
- Catherine April 16th, 2022 three:45 pm
Thank you, Ludo. I am at present having an event with the thesaurus file. After exporting the identified noun phrases (with at least 1 occurrence), I imported these into Excel (all substantive phrases from several corpus files into ane Excel sail) to utilize them equally the basis for my thesaurus file. I have over 4k labels and I added "supplant by" labels for over 3k of them. The remaining labels are meant to be ignored past VOSviewer. I then saved the Excel worksheet as a tab delimited text file. However, when I use the text file into VOSviewer, some of the label-replace by pairings are flagged as errors by VOSviewer: "A label cannot be both in the label column and in the replace past column." An example is the characterization "rapid adoption" replaced by "adoption". After getting around ten of these, I saved these "fault" pairings as a separate thesaurus file and VOSviewer accepted them without any errors. I'm assuming then that the pairings are not the upshot but something with my original thesaurus file? I thought mayhap saving it every bit a text file from Excel created an issue, then I copied the content from the Excel canvass into Notepad++, merely this did not solve information technology. I'thou quite stuck at this point. If information technology wasn't for the over 4k labels, i'd manually re-create each pairing into Notepad++ (i likewise tried Notepad, just the same issue). Is there another mode I tin save the thesaurus from Excel to Notepad without VOSviewer giving an error? Or is there something to look out for when doing then that may exist glitching VOSviewer into giving an mistake?
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- Ludo Waltman Apr 16th, 2022 6:12 pm
Replacing 'rapid adoption' by 'adoption' is perfectly ok. However, VOSviewer doesn't accept a thesaurus file in which the same term occurs in both columns (not necessarily on the same line). Hence, it is non allowed to replace term A by term B and term B by term C.
Saving your thesaurus file equally a tab-delimited text file in Excel should be fine.Reply
- Catherine April 20th, 2022 11:38 am
Thank yous! That was definitely what was tripping upward my thesaurus file and was able to clear it upwardly. I now notice that if "and" was replaced with "&", noun phrases like "research & development" are identified by VOSviewer. I'thousand wondering why that is happening?
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- Catherine April 20th, 2022 11:51 am
Just a note: I was trying to transport the to a higher place bulletin several times as it kept maxim the verification expired until I got a bulletin saying that my IP was banned due to suspicious activity. I couldn't access the website afterward that. I am now on a dissimilar IP and when I went to this webpage, I saw that my message had already gone through. Does this mean I can no longer access your website with the offset IP? Is there a way to clear the ban? Thank you.
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- Catherine April 20th, 2022 12:02 pm
As well, it doesn't seem like all plural substantive phrases are converted to singular. For example, "primal enabling technologies" and "primal enabling technology" are both in the "Verify selected terms" department of "Create map".
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- Catherine April 20th, 2022 12:34 pm
Some other note: the �Share� icon doesn�t show upwards for me on VOSviewer Online. I�ve tried it on Chrome, Border, and Firefox. Is there a reason I'm not allowed to share?
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- Catherine April 20th, 2022 12:50 pm
Apologies for and so many letters: In relation to the thesaurus, what are the potential consequences, if any, if several terms, identified from different documents, are replaced by one term? For example, if the labels �co evolution� (from certificate ane), �evolutionary role� (from document 2), �cities evolf� (from document 2), and �long term evolution� (from document 3) are replaced by �development�, will VOSviewer then show �evolution� coming from 3 documents (for binary counting)? And how will this touch the relevance score and the clustering? Thank you.�
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- Catherine April 16th, 2022 3:56 pm
For (1), but clarifying that the max links possible is 10,000? I tried going beyond that, but VOSviewer kept switching it back to 10k. Likewise, yes, yous're right. When I went upwards to 10,000, I finally saw the links. Give thanks you for that.
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- Ludo Waltman April tenth, 2022 ane:nineteen pm
Aye, this is fully correct.
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- mai April 1st, 2022 three:36 pm
maixiaojunbst@gmail.com
hi. can I ask why the co-occurrence and other cull not available only the co-writer can work? the total included reference is 88, and I also update the application to the latest ane. thanks for your guys answers.Respond
- Ludo Waltman April 1st, 2022 x:28 pm
The options available in VOSviewer are dependent on the type of data provided as input to VOSviewer. I am not sure what kind of information you are working with, but apparently data for co-occurrence and citation-based analyses is missing.
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- Nurmardhiya Darnalis March 31st, 2022 iii:39 am
Howdy. I accept one question. What if 1 authors was from 2 countries / institutions? How was this handled in the Vosviewer?
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- Ludo Waltman March 31st, 2022 7:32 am
Both countries/institutions will be taken into account. In a co-authorship analysis of countries/institutions, this ways the two countries/institutions volition be considered to be co-authors.
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- Zahra Fard March 26th, 2022 7:16 am
Hello!
I accept a basic question. If we import bibliographic data files from diverse sources such equally both web of science and scopus, does VOSviewer amass the references with recognition of repeated sources?Reply
- Ludo Waltman March 26th, 2022 ix:35 am
I am afraid it is non possible in VOSviewer to combine data from different information sources.
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- Catherine April 5th, 2022 4:13 pm
Depending on how many references y'all take, maybe you could try combining both into ane text file; just make certain that yous format them the same. I had a small number of WoS references so I was able to format their biblio data equally per Scopus' format (a tedious process even with just a small number of references) and so add the re-formatted WoS references into your Scopus text file to upload into VOSviewer.
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- AMRUTHA March 24th, 2022 7:47 am
Hello, while we are working on text data using Vos viewer .nosotros tin exclude words but If one word occur in curt form and other discussion in full form. How to add the occurrence of ii words since two words are same. For instance if total organic carbon occurred in 5 time & Toc(brusk form for full organic carbon) occurred in ten times. How to add occurrence, if I exclude whatsoever give-and-take total time of occurrence is less and result is incorrect. Is at that place any way to add. Kindly assist me
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- Ludo Waltman March 25th, 2022 7:30 pm
Not sure if I sympathise your question in full particular, merely I think this effect can be addressed by providing a thesaurus file equally input to VOSviewer. You tin use this file to merge different variants of the aforementioned term. See the VOSviewer manual for more than details.
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- Amin Nasir March 24th, 2022 iv:04 am
is very good idea
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- Rumiana Koynova March 22nd, 2022 10:23 pm
In the Manual, sample thesaurus files are mentioned - thesaurus_terms.txt and thesaurus_authors.txt
Where tin can I find these files?
Thanks!Reply
- Ludo Waltman March 23rd, 2022 10:42 am
When yous download VOSviewer from the download page on the VOSviewer website, y'all will obtain a ZIP file that includes the sample thesaurus files.
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- TAEKU WANG March 18th, 2022 8:40 am
how-do-you-do,
I am a user of the app vosviewer
I have been using vosviewer software for more than a twelvemonth, give thanks the programmer very much.
There is a question near the new version of the example. In the instance Delineating COVID-19 and Coronavirus Research provided by the website, how is the Topic Modeling in "Using topic modeling we further characterised these iv largest clusters." implemented?
I didn't find an explanation on the usage of Topic Modeling in your website, hope to get your answer.
thanksAnswer
- Ludo Waltman March 20th, 2022 viii:39 pm
Topic modeling is not supported by VOSviewer. However, there are quite a few tools available to perform topic modeling. My advice is to utilise one of these tools.
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- Upendra March 4th, 2022 half-dozen:35 am
Thank you for the software development.
I hope you are in good wellness and spirit.
I have few queries and questions.
ane- Subsequently downloading the software I couldn't run the application as it shows this error " This application requires Java Runtime Surroundings 1.viii.0" which I am unable to download. Even the online software is not functioning properly.
2- Secondly, I wanted to do a citation assay of summit 100 articles in a specified field; how should I proceed with information technology. How tin can I excerpt the data to be uploaded on the Software and in what format from the databasesReply
- Apichai Wattanapisit Feb 27th, 2022 half-dozen:39 am
Howdy,
On the verify selected keywords window, I found both keywords with asterisk signs (*covid-xix, *sars-cov-2) and keywords without asterisk signs (due east.thou., covid-nineteen, sars-cov-2). Accordingly, the summation of both occurrences (*covid-xix (n=274) + covid-19 (n=1,000)) is greater than the total number of search results (n=i,000).
What are the difference of the keyword with and without asterisk?
Thank you.Reply
- Nadeesha February 26th, 2022 five:27 pm
I want to export manually entered bibliographic information gear up to VOSviewer. which option should I select for "choose type of data"?
Actually, I want to enter full manuscripts in proceedings too. That'south why I want to do it. I want to do bibliographic information for relevant keywords only for one country.Reply
- Ludo Waltman February 26th, 2022 vii:24 pm
What do you mean by a 'manually entered bibliographic data set'? Yous need to brand sure your information prepare is provided as input to VOSviewer in a file format supported by the software. Which file format are you using?
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- G Etemeadi February 23rd, 2022 4:12 pm
Howdy.
I take a problem while importing CSV file from Scopus VOSviewer. The error is: Incorrect Number of Columns.Reply
- Ludo Waltman Feb 23rd, 2022 6:52 pm
Unfortunately, due to bugs on the Scopus side, CSV files exported from Scopus sometimes cause difficulties. There is no piece of cake way to solve this problem, just it may help to include only the well-nigh essential fields in the information that yous consign from Scopus, and to exit out other fields.
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- Viva February 22nd, 2022 4:55 pm
Hello,
Is information technology possible to comport literature review using this tool?
Thanks.Answer
- viva February 22nd, 2022 4:57 pm
or is information technology more than about noesis mapping?
P.S. my first comment was non published in fullRespond
- Ludo Waltman February 22nd, 2022 5:53 pm
A commendation-based map of individual articles might be useful to support literature reviewing, merely VOSviewer was non developed for this purpose. You may want to take a await at Aaron Tay's blog (http://musingsaboutlibrarianship.blogspot.com/) for data about other tools that can exist used to support literature reviewing.
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- Viva February 22nd, 2022 8:12 pm
Thank you lot, Ludo.
I appreciate you reply.Respond
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- Amrutha February 22nd, 2022 8:08 am
Hullo,
I am unable to do co-occurrence in vos viewer installed in system. Information technology is showing only bibilographi coupling ,co-commendation etc but it is not showing co -occurrence.That is, in that location is no pick for co-occurrence but I want to practice occurrence .Is there whatever style to do co-occurrence.please help
Thank youReply
- Ludo Waltman February 22nd, 2022 nine:x am
In the 'Create Map' sorcerer, consider using the selection 'Create a map based on text information' instead of 'Create a map based on bibliographic information'.
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- Jaymes Rombaoa February 20th, 2022 9:09 pm
Hello there!
I'm trying to import virtually 36,000 Web of Science records (over lxx .txt files) for a bibliographic coupling projection.
I currently become the "Out of memory. VOSviewer volition exist terminated. Please refer to the VOSviewer transmission to increases the availability of memory."
I'm currently on VOsviewer version one.half dozen.18; I'yard also using a MacBook Pro 2020 (MacOS Monterey) with Retentivity = 8 GB.
I consulted the Manual, but I'k not entirely sure on the steps or what exactly to exercise to increase the availability of retentiveness. Likewise I'chiliad not sure on how to run the VOSviewer from the command line and enter those commands.
Whatever help or step-by-stride guide would be then appreciated!
With gratitude,
Jaymes
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- Ludo Waltman February 21st, 2022 x:19 pm
In the Nigh dialog box in VOSviewer, you tin can come across the amount of memory to which VOSviewer has access. If VOSviewer already has access to most memory in your computer, information technology won't be possible to increase the amount of memory that VOSviewer can utilise. Otherwise y'all could indeed follow the steps discussed in the manual to increment the corporeality of retentiveness that can be used by VOSviewer. However, I am agape I cannot offering further assistance with this. My communication is to enquire for assistance from a local ICT good who knows how to work with the command line.
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- Beatriz Murer February 20th, 2022 viii:35 pm
Howdy,
I hope this bulletin finds you lot well. Thanks for the software development. It is very helpful!
I would like to check iii data:
(I) Is there a default clustering algorithm? I ask this because I am generating a VOSViewer network view from the Bibliometrix R package and no matter which algorithm I use in the R networkPlot role, the same network (with the aforementioned clusters) is generated in VOSViewer (when the clusterization should be different depending on the algorithm entered);
(Two) Is there a maximum corporeality of nodes entered in a network view in VOSViewer? I ask this because when I endeavour to open a large network (more than 50000 nodes) in VOSViewer from the Bibliometrix R bundle using the "net2VOSviewer" office (https://github.com/massimoaria/bibliometrix/hulk/master/R/net2VOSviewer.R), I become the error: "Error reading Pajek network file: Incorrect use of quotes". And the error does non appear when the amount of nodes is smaller;
(Iii) Is the maximum view of the links (connection between nodes) actually 10000? Because I accept a network with more than 300000 links, and it would be very useful to meet all their connections in VOSViewer.
Thank you very much.
Best regards,Reply
- Ludo Waltman Feb 21st, 2022 9:35 pm
VOSviewer is non intended for visualizing very large networks. Other tools, such every bit Gephi, are more than suitable for this. Nosotros recommend to accept at most 10000 items in your network. Your network may consists of more 10000 links betwixt items, but the maximum number of links that tin can be visualized past VOSviewer is 10000. I am agape I don't understand your first question. The VOSviewer transmission provides some information nearly the clustering technique used by VOSviewer, including a link to the relevant research papers.
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- Beatriz Murer February 22nd, 2022 1:36 am
Thank yous very much for your quick answer, Ludo!
In my outset question I was referring to clustering algorithms such as "optimal","edge betweenness", "louvain", "infomap", "walktrap", "spinglass", "leading eigen", etc - which indicates the type of cluster (agregation between the publications).
I haven't found this specification explicitly at VOSviewer manual, which is why I asked here. What I did find was the indication of using an "optimization algorithm" and the linked research papers - which indicate the Newman algorithm. So I'm notwithstanding non sure if VOSviewer uses the optimal algorithm, Newman'southward algorithm, or whatsoever other. I'm sorry if it's all the same unclear. Once again, cheers!Respond
- Ludo Waltman February 22nd, 2022 7:25 am
The clustering technique used by VOSviewer is documented in the following paper: https://doi.org/10.1016/j.joi.2010.07.002 (preprint: https://arxiv.org/abs/1006.1032). To optimize the quality function of this clustering technique, VOSviewer uses the Leiden algorithm, documented in the post-obit paper: https://doi.org/10.1038/s41598-019-41695-z.
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- Beatriz Murer May 11th, 2022 5:45 am
Hi again, Ludo!
I actually capeesh your last return.
What I would similar to ask now is still related to clustering algorithms, as you are more aware nigh it and perhaps could help me.
I am looking for a community detection algorithm, which made me decide for louvain (multilevel - based on https://world wide web.nature.com/articles/srep30750) - as this is the recommendation to big and mixed networks, as mine. But in your terminal respond, y'all brought to light the improvment from louvain to leiden (https://www.nature.com/manufactures/s41598-019-41695-z). Therefore, I would like to use this means of communication to ask you if you would have any reservations near using louvain to detect communities in large and mixed networks - and considering that the visualization is just an extra in my objective and that the network assay (mainly the clarification of the communities/modules/clusters) is more of import.
Thanks once more!
Best,Respond
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- Vivi February 20th, 2022 5:13 pm
Hi Ludo, one more dubiety delight :)
In lodge to choose the all-time clusters agroupation for co-occurrence Keywords, the words included in a Density Visualization hot signal, should be almost the aforementioned than cluster agroupation? Or is not something which I have to reffered to. I read papers that show the simmilarities between both maps and others which analysed both maps separatly. Thanks so much!Respond
- Ludo Waltman February 21st, 2022 nine:24 pm
I am not sure whether I understand you correctly, simply choices regarding the clustering of keywords shouldn't depend on what is shown in the density visualization. These 2 things have nothing to practise with each other.
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- Vivi February 22nd, 2022 1:34 am
Cheers Ludo!
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- Varun Chandra February 17th, 2022 11:29 pm
Howdy Ludo. What does a bibliographic coupling by state map correspond? What practise the links betwixt the state nodes represent?
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- Ludo Waltman February 18th, 2022 8:25 am
The links represent publications from different countries citing the same earlier work.
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- Varun Chandra February 25th, 2022 1:21 am
Ok, thanks. I too noticed in the left sidebar that under the "items" tab, there is a listing of all countries involved, and if I click on one, information technology will show the number of documents at the bottom, along with link strength, and number of links. What does this number of documents correspond? Is it the number of documents originating from that country?
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- Ludo Waltman February 25th, 2022 8:02 am
Yes, information technology is.
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- Joseph February 15th, 2022 i:45 pm
Hi Ludo, 1 more question please! I created a map based on bibliographic coupling/co-occurrence/all keywords and total counting. Could you delight explain based on what the clusters are formed? I have a discussion with occurrence only 3 and total link strength of 34 and it�s in cluster ane.
Thanks heaps!Reply
- Ludo Waltman February 16th, 2022 8:48 pm
I'grand afraid I don't fully understand your question. Creating a map of keywords based on bibliographic coupling is non possible in VOSviewer.
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- Joseph February 17th, 2022 five:14 am
Hi Ludo
Here are the steps that I chose to create the map:
one-Create a map based on bibliographic information
2-read data from bibliographic database files
three-upload Scopus CSV file in the right section
4-chose co-occurrence / unit of measurement of analysis: all keywords / counting model: total counting
5-occurrence of keyword adapted to iii
six- then clicked next and finished
My question is related to the clusters obtained after following the above steps. Based on what are these words distributed to the relevant clusters?
Thanks and pitiful for the defoliation!Reply
- Ludo Waltman February 18th, 2022 viii:30 am
Thanks for the clarification, Joseph. Clusters stand for groups of keywords that are relatively strongly connected to each other based on co-occurrence links, or in other words, groups of keywords that occur together in the aforementioned documents relatively frequently.
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- Gabriel Oliveira February 14th, 2022 11:41 pm
Boa noite, european union tive um problema enquanto tentava carregar um arquivo .txt que exportei da Web of Scientific discipline, contudo, o programa apenas me mostra uma mensagem de erro de que arquivo � inv�lido devido a um problema n�o especificado na primeira linha.
E n�o, o arquivo .txt n�o foi editado antes de inseri-lo no programa.
Como european union posso resolver esse problema?Respond
- Viviana February 14th, 2022 12:09 pm
Hi Ludo, hope you lot are ok! Maybe it'due south an ovbious question, pitiful for that. In regarding KW co-ocurrence, I have some difference between cluster agroupation and density visualization hot points, are supposed to testify the aforementioned groups of words? I imagine that should exist simmilar since both are indicating an clan between KW, is that correct?
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- Ken Mwathe Feb 12th, 2022 11:17 am
I want to analyse national policy documents to make up one's mind the extent to which they support biodiversity conservation in agriculture in Kenya. Does Vosviewer support using PDF databases of national and county government policies, strategies and plans?
Thank you, KenReply
- Ludo Waltman February twelfth, 2022 3:47 pm
No, I'g afraid this is not supported.
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- Joseph Guirguis February 10th, 2022 12:01 am
Hi team,
Is there a way to export clusters afterwards bibliometric assay to an excel canvas? Thanks for your help and great task on designing Vosviewer!Respond
- Ludo Waltman February 10th, 2022 7:29 am
Yes, y'all tin save your map in a VOSviewer map file and open this file in a spreadsheet plan such as MS Excel. Cluster information tin be found in the 'cluster' cavalcade.
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- Joseph February tenth, 2022 7:37 am
Amazing! Cheers team for your prompt response.
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- Mahdi Zeynali February 9th, 2022 ii:12 pm
Honey Nees January and Ludo
Capeesh you lot very much for carefully designing the necessary VOSviewer software. This used software was designed user-friendly and usability manner. I watched some published videos and read some manufactures and book chapters almost that. In this way, I sufficiently learned key application of it.
All the best, Mahdi.Answer
- Vivi February 9th, 2022 11:20 am
Good morning time Ludo, hope you lot are ok! I wonder if it is possible to make an overlapping map comparing countries keywords. In this case, at that place is whatever document which explain how to do it? Cheers!
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- Ludo Waltman February 10th, 2022 8:37 am
Practice you mean yous desire to create a keyword co-occurrence network (or peradventure a network of co-occurrences of terms extracted from titles and abstract) and show a so-chosen overlay visualization in which colors are used to highlight the focal topics of different countries?
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- Vivi February 10th, 2022 nine:05 am
Give thanks you lot Ludo for your respond.
Exactly! I want to create a keyword co-occurrence network and testify an overlay visualization and highlight the focal topics of different countries. Is that possible? In this instance, in that location is any certificate I could read to sympathise how to do it?Reply
- Ludo Waltman February 11th, 2022 5:52 pm
For keyword co-occurrence maps there is no like shooting fish in a barrel mode to practice this, but for co-occurrence maps of terms extracted from titles and abstracts this is possible. You can then brand use of corpus and scores files. If you lot're interested, experience free to contact me by email. I can then give a bit more than information.
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- James Phillips February 8th, 2022 xi:fourteen pm
Ludo:
The innovative piece of work of your squad might attract resources from the philanthropic arm of Google: "The Google Foundation." The problems that you note in your response to my query about Google Scholar might be solvable if you lot had resource to collaborate with Google itself. The humanitarian value of VOS-Viewer is amply demonstrated by publications that have used your tool for health inquiry. Jim PhillipsReply
- James Phillips February seventh, 2022 four:56 am
A mutual claiming that I face is not with the employ of VOS-Viewer, but rather with the training of information for input to your software. The information archive SCOPUS has the advantage of representing commendation key words that are human reviewed. And, SCOPUS output is VOS uniform. But, the coverage of SCOPUS tin exist incomplete. I would like to work with Google Scholar which has massive coverage. Unfortunately, accessing and using Google Scholar output is problematic apart from its immediate display of individual citations. There is no feasible means of utilizing Google Scholar search brandish output equally VOS Viewer input. Correct? Do yous have web searching and data compilation tools advice to impart?
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- Ludo Waltman February 7th, 2022 nine:20 am
Indeed the use of Google Scholar data in VOSviewer is nigh impossible. It is very difficult to excerpt significant amounts of data from Google Scholar. VOSviewer used to provide support for working with Microsoft Academic data, which could serve every bit an alternative to Google Scholar. However, Microsoft Bookish was discontinued at the end of final yr. The virtually contempo version of VOSviewer offers back up for OpenAlex, a successor of Microsoft Academic. VOSviewer enables users to query OpenAlex through its API. Nonetheless, this functionality is nevertheless in an early stage of development, and then the possibilities are express. Dimensions might be another culling to Scopus. VOSviewer offers quite all-encompassing support for working with Dimensions data, like to what we offering for Scopus.
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- Eka Hartomy February 2d, 2022 one:34 pm
Excuse me, I take a question
I want to do co-occurence analysis in VOSViewer, but I tin can't choose the option. How do I solve this problem?
Thank youAnswer
- Ludo Waltman Feb second, 2022 7:25 pm
If y'all want to practice a co-occurrence assay of terms extracted from titles and abstracts of publications, make sure to choose the option 'Create a map based on text data' instead of 'Create a map based on bibliographic data'. If you want to do a co-occurrence analysis of the keywords of publications, the availability of this option depends on the data source you are using. Some data sources support this choice, while others do not.
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- Eka Hartomy February third, 2022 eleven:xv am
In my case, I exported .ris and.csv files from dimensions.ai.
Exercise you know what the problem is?Reply
- Ludo Waltman February 5th, 2022 6:28 pm
Dimensions has a special export characteristic for VOSviewer. Brand sure to use this feature. Don't use the RIS format. Dimensions doesn't have keywords for publications, so Dimensions data cannot be used to create a co-occurrence map of keywords. You can use Dimensions data to create a co-occurrence map of terms extracted from titles and abstracts of publications.
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- Eka Hartomy February sixth, 2022 11:23 pm
It worked! Give thanks you very much Ludo, hopefully we can discuss another enquiry-related topics once again
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- Viviana Feb 2nd, 2022 7:47 pm
Hi Ludo, thank you so much for you lot continuing assist! Relates to this question I take a doubt which I couldn't observe or totally empathize from the manual. A higher resolution number means more specidicy? I tried many different combinations of resolution number, min cluster �tems, as well every bit co-ocurrence umbral for keywords. Finally I got to a result which convince me, only I have higher up doubt since with unlike number of resolution (3 and 5) and the same min cluster �tems (6), I got to the same number of cluster which has different give-and-take compossition. So, I'm not certain which I have to choose, both has sence. I wonder if (for this example) five means more specificity than 3. Than you one again for your help and disign this favulouse tool.
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- Ludo Waltman February second, 2022 7:55 pm
It's a bit hard for me to answer your question without seeing the actual results yous get. Moreover, I'thousand not sure what yous mean by the values of 3 and 5. Are these values of the resolution parameter? Such values are rather high. Normally the value of the resolution parameter shouldn't exist higher than 2.
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- Viviana February second, 2022 eight:17 pm
Oh actually!? I tried many diferent ones equally the manual suggested "We recommend to try out different values for the Resolution parameter and to use the value that yields the most appropriate level of detail for one�s
purposes." So, every bit I understand now is amend yo utilize the default resolution number? (1). Cheers do much!Answer
- Ludo Waltman Feb second, 2022 11:45 pm
I don't recommend to simply employ the default value of 1. I believe trying out unlike values is important. Values to a higher place two are uncommon, but as already mentioned, it's hard for me to comment on your results without actually seeing them.
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- Viviana Feb 3rd, 2022 4:12 am
Cheers Ludo!
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- Viviana February 3rd, 2022 12:45 pm
Good day Ludo, could you please confirm to me if there is an "upper limit number" for min items cluster? On other hand, in your reply to Eka, you mention that "If you desire to do a co-occurrence analysis of the keywords of publications, the availability of this option depends on the information source yous are using. Some data sources support this option, while others do non." I constructed my data base with unlike data sources, and I call back information technology's working well, there is something which I have to look to detect that something is not working so well? Cheers so much and sorry for bother you!
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- Ludo Waltman February fifth, 2022 6:33 pm
Non sure if I fully understand your question, merely in principle there is no upper limit.
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Source: https://www.vosviewer.com/getting-started
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