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I am working on a mathematical model to help explain some experimental results and generate new hypotheses. Unfortunately, I have neither the resources nor interest to gather experimental data, but in this particular sub-field publishing a model without showing its usefulness on some experimental data is not common.

There are several existing experimental findings that can be explained by my model. However, they are presented in other modeling papers and the raw data is not available with the paper or on the authors' websites. In the papers they only present partially-analyzed data (for instance, they show results averages over participants, but not individual participant's results; or sometimes they only give the results of statistical tests).

I want to contact the authors for their raw data and have 3 related questions:

  1. What is the protocol for contacting by email to ask for authors' raw data? Is this common?
  2. Will the researchers expect to be invited on-board as co-authors? Or is a citation to their papers, and an acknowledgement of the form "AK would like to thank X, Y, Z for providing their raw data" sufficient?
  3. If my model (without fits to specific data) is in a pre-print state then should I send a pre-print to the authors I contact? What if the pre-print points out weaknesses in their approach to modeling similar problems?
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See a site for requesting data from papers: isitopendata.org –  Piotr Migdal Jun 18 '13 at 8:42
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3 Answers 3

up vote 17 down vote accepted

This will, as it seems nearly all questions on this site, vary based on field. My answer applies to Epidemiology and medical research only. Your mileage may vary.

  • It is very common for this to happen in my field. There has been an increasing emphasis on using meta-analysis and systematic reviews to summarize bodies of work, and with those there is almost always a need for some more information, raw data, etc. to come from study authors. It's fairly routine now. They may no say yes however, for a number of reasons. One may be that they're working on their own projects in a similar direction. But there are others - that privacy laws prohibit releasing data to just anyone or their funding dictates similarly is a fairly common one. So be prepared for "no".

  • As for the authorship question, it likely depends on the extent of your data request. Generally, if you're just asking for a few numbers that go into a reported value, then in all likelihood, an acknowledgement is more than sufficient. If, on the other hand, you're asking for access to the raw data from their 5 year, many thousands of dollars cohort study? You're likely going to have a member of their study team be an author on your paper, and there will be far more extensive approval processes than just "Sure, .csv file is attached."

  • "If my model (without fits to specific data) is in a pre-print state then should I send a preprint to the authors I contact? What if the preprint points out weaknesses in their approach to modeling similar problems?" For the initial contact, I'd suggest it isn't necessary, because what you're really trying to find out is "Is the release possible". At later stages, I would expect to see what you were doing, either in a full explination, or as a pre-print. As to your "What if?" question - so what if it does? Science is about improving the methods we use.

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I do not think of it as the amount of data being asked for, but rather the extent to which the data is critical for publication. Supplying a ton of data which gets condensed down into a single data point in the publication does not warrant authorship in my mind. Supplying a single number which is critical to the publication might. –  StrongBad Jun 11 '12 at 9:02
    
@DanielE.Shub It may indeed vary - I picked an example in my field of a request that would very likely require approvals, authorship, etc. –  Fomite Jun 11 '12 at 9:26
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Many journal formats (and the arXiv) indicate a "corresponding author". That's the person you'll want to contact.

Doing so isn't a everyday occurrence, but it does happen.

In some fields access to the data may be covered by agreements to keep it confidential for a certain period of time (or until first publication). These agreement often specify the answer to the authorship question as well.

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While I would try the corresponding author at the given email address, often the corresponding author is the grad student who did the work. Grad students tend to move after finishing and sometimes even drop out. If that fails, and I didn't know anyone on the paper, I would try the last author. –  StrongBad Jun 11 '12 at 9:00
    
In principle, the arXiv lets corresponding authors keep the contact email up-to-date, but the fall back strategy that Daniel suggests is good. –  dmckee Jun 11 '12 at 13:36
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This may or may not be helpful in this case, but you may be able to persuade them to publish the data separately, in a dedicated data journal or other data archive. Depending on the field, they may already have done so (some UK funders, for example, are starting to require this as a condition of funding).

This gives you the additional option to give credit by citing the dataset directly as well as relevant papers, and also opens up the possibility that others will use and cite the data as well, bringing more prestige to the original researchers.

Currently, some researchers are open to this type of data publication, while others are not, so your mileage may vary.

If you want to find data to reuse, or to suggest somewhere for them to deposit, there are some lists of archives available to look through, such as the DataCite repository list and Databib.

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As a side note, figshare allows to upload raw data and get a DOI identifier for that (making it easy to cite and get credit). –  Piotr Migdal Nov 9 '12 at 11:48
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