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Hola a todos! Intento analizar una base de datos de WOS, sin embargo al ingresarla a vosviewer me sale el siguiente error "multiple AU fields". ¿Cómo lo resuelvo?
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Thank you so much for your efforts
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ok
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hi
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Have the developers noticed that the red/green/blue columns in map files are being ignored in versions 1.6._19 and 1.6.20? I have tried to submit a message about this bug via the contact form twice but I am not confident it is submitting successfully, it just loads a blank page. Does anyone have a macOS installer for version 1.6_16 they might be able to share? That's the last version where this feature was still working, but I've unfortunately uninstalled it from my computer.
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Dear all, is it possible to save our results with VOSviewer and open them later in the program?
When I save the file with "save...." after opening it in VOSviewer, it is not possible to see the lines connecting the keywords. I can only see certain keywords
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Hello, when I select the files, an error of "multiple AB fields" pops up, but I don't know how to amend the ris. text, or is there any other solution? Many thanks.
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Perhaps you can consider open-sourcing this awesome software so that we can assist you in completing compatibility upgrades and issue fixes
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atoui soumia
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I already successfully installed Java 8 Update 401 in my mac but the VOSviewer still show that it's unable to load Java Runtime Environment. What can I do?
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Hi Nees Jan van Eck and Ludo Waltman. Just trying to download AIDA booklet and it appears that the download link provided does not work anymore. Here is (I guess) the updated working download link. Thanks for your valuable work developing VOS, and cheers from Chile! https://pure.tudelft.nl/ws/portalfiles/portal/40154954/AIDA_Booklet_V2.2.pdf
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Hi, I'm trying to import Lens data (.csv) but it keeps saying 'Error while reading Lens file: Cannot find Author/s, keywords, MeSH Term, or References field'. But I didn't edit anything since I downloaded the data from Lens. and it happens with all my files I downloaded from Lens. What can be done? thanks in advance!
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I can't open VOSviewer anymore after I worked a couple of weeks with it. This Error code appears always: "unable to load Java Runtime environment".
I've updated the program, java and my mac, but it doesn't helped at all. I've also deleted and reinstalled.
Does someone might have a solution for that?
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Anyone had any success using Endnote to create a map based on bibliographic data? When choosing data source, VOSviewer looks for an EndNote file type of .enw but Endnote now uses .enl file type. Tried using a .enl file but a get an error "error while reading Endnote File.
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Hello,
While I have successfully run vos viewer a number of times, I just received the following error message when trying to create a citation map:
An unexpected error has occurred (java.lang.NegativeArraySizeException: -2052726983 at line 206 of Arrays.java). VOSviewer will be terminated.
Any help is appreciated!
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Hello. I am trying to export a graph as an SVG file . However, I am getting the following error many times:
"This page contains the following errors:
error on line 16 at column 7: Encoding error"
For other format like PNG, jpg do not have this issue. Please help me with this, thank you!
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How do we start generating a map on our topic?
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Hi, I have the map, but how do I identify the research gap using the map? I still lost.
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Hi! Is it possible to see which papers belong to each cluster?
Thank you! Francesca
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This is a fantastic tool. I'm just wondering - is it possible to access the citation from the node? The visualization is helpful but can it work in reverse? This seems like a very useful feature but I can't figure it out.
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It depends from what visualisation you are using. As far as I know, you can do this only if you display a 'citation' network, by document - so if you display a map of which articles are connected by a citation. If you do, and you double click on a node, it will open up a link to the original article (not sure if this works only if the reference contains the DOI).
If you are visualising a co-citation network on the other hand then no, you can't reverse access the citation just by clicking on the node. In this type of visualisation, VOSViewer uses the citation data to build individual 'tags' for each document in order to generate a co-citation network, so there is just a string of text behind each node. There is no link VOSViewer can use to redirect you to the original article, because the tags the software is using are generated each time you run the analysis.
This is my understanding, if anyone else knows how to implement this let us know!
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One of my PhD students found the solution to multiple authors appearing on each 'line' when you run author co-citation analysis in Scopus. The solution is to export a "saved list" rather than the initial search results.
1. First save the filtered list of documents on the search page to "Saved Lists".
2. Reopen the list from the "saved lists" section.
3. Then export the list to a CSV file from the document list page.
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Sorry, i didnt understand very well the process. Which list do you save? is it the first column of the CSV, the column "document ype or another one?
I have read that the problem is the separation of the authors names with ";" instead of "," yet, when i chaged them from ";" --> "," vosviewer doesnt read the document for the error " (line 1) invalid char between encapsulated token and delimiter.
I hope you could explain me. Thanks!
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Hi! The link to the AIDA booklet generates an "Access Denied" message. Although I found the booklet here: https://research.tudelft.nl/en/publications/research-positioning-amp-trend-identification-a-data-analytics-to (there is also a direct link to the PDF: https://research.tudelft.nl/files/40154954/AIDA_Booklet_V2.2.pdf)
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hai I have trouble when I want to open this software after download.
this is the statement warning "error: could not create the Java Virtual Machine. Error: a fatal exception has occurred. program will exit." could you please tell me how to fixed it?. I have already downloaded this software twice and get the same statement warning.
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Has anyone been able to resolve the issue with Scopus changing the delimiters in csv exports? I've been unable to complete any analyses since this change.
I'm hoping that VosViewer will be updated to address this issue but would love tips from other users!
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Thank you for the platform. I am working on a bibliometric literature review article. I generated a Network Visualization of keyword co-occurrences. I took screenshots of the visualizations and included them in my paper. However, the journal editor suggests that I need to work with the output from VoSviewer (and recommends MS Power Point) in order to mark the clusters with dotted lines or circles.
Anyone who can help how I export the visualizations in PPT or word?
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Hi
Easy. Either use export screenshot or select the map and paste into ppt. Once the map is in ppt you can insert circle lines around the coaster and insert text to name the clusters. Similarly, you can use insert text function to insert text boxes to name more of the nodes.
This is particularly important for journals that have print version where the map will be produced in grayscale.
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Dear sir/madam
i am using Microsoft surface 6 pro with win11. although java have been installed, the vosviewer does not work and this message has been shown "Error:could not create java virtual machine. a fatal exception has occurred. program will exit".
please help me to solve it
tnx
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Well, that's one of the stupider requirements that I've heard from a journal editor. And after publishing 250 articles, I've heard a lot of stupid requirements!
I thought that I'd suggest a workaround by creating a thesaurus file that would replace the lower case with title case names. However, when I tested it myself, it didn't work. So this appears to be something integral to the program code. Maybe Prof W. will have an option for you, but maybe not.
In the meantime I would go back to the editor with a three point strategy.
1. Explain again that it's not possible with the software.
2. You might also point out that such maps have been published in numerous journals (name a few prestigious journals in your field that have published maps generated in VOSviewer).
3. Finally, note that this is akin to SPSS output that is often published in figures that include text in non-standard formats.
If there is no way to do it in VOSviewer, and the editor still insists that this MUST be done, then your only alternative would be to copy and paste the maps into powerpoint. Create new title case labels using the insert text box function. Then put the new labels over the old ones. However, this will be very time consuming and probably not look very good in the end if you have a map with more than 100 items on it.
Good luck!
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Dear Philip,
To replace the lower case with title case names, it can be done by editing the VOSviewer map file (.txt). To get this file, click Save (not Screenshot > Save, but the direct Save button on the screen, right below Create and Open). Give the files a name and save the map file and network file. Then open the map file with Excel. You may need to use the 'Sort data to columns' function in Excel. Replace the lower case with title case names, then save the file. Remember to save it in .txt format but not .xls format.
Back to VOSviewer, click Open. Choose the edited map file and the (no edit) network file. The map should look like what you want. See if it works.
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I have worked on a publication involving bibliometric analysis, which is stuck with a query.
The editor has asked to prepare the figures (author and country network maps) following English grammatical rules, i.e. to capitalize the initials of names of authors and countries.
However, since the figures are software generated, I have not been able to resolve the query.
I downloaded the data from the Web of Science Core Collection and used vosviewer for performing bibliometric analysis.
Can somebody help in resolving the query for capitalizing the initials of author and country names.
Thanking you in anticipation.
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Hi
I am not writing today with a question, but rather to share how I've been using VOSviewer as a means of helping my first-year PhD students learn about the literature in their respective fields.
I teach a first-term course for PhD students in which the objectives include 1. familiarizing themselves with key research in their topical areas (i.e., themes, authors, documents, journals), 2- document search, 3. data analysis, presentation, and interpretation, and 3. writing for publication.
Initially students learn how to search in Scopus, run Scopus analytical tools, and export a document list to Excel. Then they learn step by step how to run selected data analyses in VOSviewer. Each student draws on these data to write a complete 8K-10K bibliometric review of research on his/her topic in a publishable format by the end of 15 weeks. About 50% of the students in each cohort have been able to publish their bibliometric reviews in Scopus Q1/Q2 journals, in either first or second year of the program.
But whether or not they can publish the review is not actually the point here. The main takeaway is that by going through the process of conducting a bibliometric review the students have - in just 15 weeks - learned who the key authors are in their field of study, which documents MUST be read, which theories are pertinent to their topics, which journals they should read and seek to publish in, dominant themes, and the research front.
I've been teaching doctoral seminars since 1984, and this is absolutely the fastest and most effective way that I have found to for PhD students to get up to speed on their topics. Of course, this doesn't mean that they have READ the top-cited documents, but at least they now know what documents and authors they should read in subsequent terms.
If there are other PhD instructors who would like to see my syllabus, please send me an email at my last name @gmail.com.
Philip Hallinger
P.S. Apologies in advance to Prof Waltman if this is considered off-topic. However, I think users should be aware of other potential uses of the software.
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I am writing a article these day, i need to the biliometric analysis and i would like to use your program. I am writing to inquire about your program. Because screen goes to macbook lock screen when i opened on VOSviewer and everything is not coming back to the home screen. When i am writing my password or fingerprint but returns to the same screen again. How can i do?
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Is there a way to export clustered items in VOSviewer?
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Hello, I've used VOSViewer before with great results, but I cannot run it on my new Macbook Pro with M1 chip work laptop. I installed Java through Homebrew --> Temurin, and created the required symlink, but when I try to run VOSViewer or launch it from web I always get the error message "Unable to load Java Runtime environment".
Has anyone been able to use VOSViewer on a M1 Mac running Ventura 13.4.1?
Thank you for the great work!
All the best,
Sebastiano
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Hello.
I am actually experiencing the exact same Issues. Also did your steps but still receiving the same error message as you do.
Can someone help please?
best wishes and thank you.
Johanna
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I have the same problem, just run it through the command line.
Here I'm in the Application directory where it is installed:
java -jar VOSviewer.app/Contents/Java/VOSviewer.jar
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I encountered the 'not enough memory available' error multiple times. Following the manual, I entered the command 'java -Xmx4000m -jar VOSviewer.jar' in the command line, but the same error persisted. Furthermore, when I checked the available memory for VOSviewer in the 'About VOSviewer' section, it consistently showed a range of 1300 MB to 1500 MB, never close to the required 4000 MB specified in the command. Can I receive assistance in resolving this issue?
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I encountered the 'not enough memory available' error multiple times. Following the manual, I entered the command 'java -Xmx4000m -jar VOSviewer.jar' in the command line, but the same error persisted. Furthermore, when I checked the available memory for VOSviewer in the 'About VOSviewer' section, it consistently showed a range of 1300 MB to 1500 MB, never close to the required 4000 MB specified in the command. Can I receive assistance in resolving this issue?"
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Hello, how could ı merge scopus and WoS data and run on vosviewer.
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I downloaded free trial file for my windows machine. It shows an error to download java script which I also did but still it shows an error which says It couldn't create a java virtual machine, a fatal exception has occurred.
Can anyone help me what shall be done ?
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Hi everyone,
I've worked with VOSViewer for several years and in many different projects. Today I encountered a problem for the first time that I can not find a solution to.
For every map with bibliographic data I try to create I receive the Error message:
Error while reading PubMed file ... (line 2): File is invalid.
Older files work, but the ones downloaded today all reveice this error message. I am aware that in Scopus download settings sometimes affect VOSViewer, but we do not have similar download options in PubMed.
Is the error on my side or were there changes in PubMed that now in general affect the way VOSViewer deals with those?
Please help!
Thank you
Jana
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Dear Nees or any other person who has used this tool.
How are you and thank you for this introduction to Vosviewer.
At the University of Twente, we would like to use your tool for our second year students who are formulating a research question about an investigation they want to do in order to answer the question: "what is the impact of AI on the digital society?"They are designing for the execution of the research question using qualitative or quantitative methods. We want them to conduct a limited literature review using this tool.
Is it possible for you to offer an introduction to our group of about 20- 25 students, or can you direct us to someone who can help?
The project starts this September.
Kind regards ,
Rita Kizito
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Hi
If I had this objective, I’d follow these steps.
1. Conduct a Scopus search using keywords suggested in your above query.
2. Limit to articles, reviews, books, chapter, conf papers
3. Screen the list for relevance.
4. Export the list to excel
5. Upload to vosviewer
6. Run document citation and co-citation analyses
7. Export top 25 from each result.
8. Use these to guide your lit review.
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Professor
Two questions:
1. I'm having trouble with an author thesaurus file. No matter how many times and ways I edit the file, s few authors' names (e.g., Johnson, D. and Johnson, D.T.) don't get merged in the author co-citation results. I've created many thesaurus files in the past, so I know what the process is, but can't solve this problem. Any ideas?
2. I just ran author citation and author co-citation analyses. Instead of giving me an author by author list of names and citations, VOSviewer is generating a list where there are multiple authors on many lines. I've never had this happen before.
Thanks in advance.
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Goodnight,
I have the same problem, I downloaded a csv file from Scopus and in the Authors column the main author and co-author are on the same line.
Now Scopus is separating with semicolons not commas anymore, is that the problem?
There is more than one author per line now.
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P. Hallinger,
Estou com o mesmo problema que você. Acrescento que a planilha do excel fica toda bagunçada, some informação e em algumas células tem informação demais.
O que fazer?
Grata desde já a quem me retornar.
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Greetings! I am trying to upload citations from Web of Science, Scopus, and PubMed together. However, it seems I can only add files from one source at a time and then the other citations are no longer included (ie- I put in the Web of Science files, but then they are no longer included when I add the Scopus files). Can anyone provide guidance on how to import data from these sources together to create one visual? Thank you!
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Dear Ludo, in bibliographic coupling (of documents, mainly) is there a way to determine the optimal number of clusters in which to classify objects? I have seen empirically that once the min cluster size has been established, by increasing resolution the number of clusters quickly stabilizes. Does this seem like a correct mode to you? I generally place the min cluster size between 30 and 40 documents (in collections between 1000-3000 documents) in order to have enough documents for any subsequent applications, for example keyword co-occurrence. I hope you are well and preparing another one of your precious packages.
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How to cite VOSviewer in our papers?
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