DataONE:ArrayExpress metadata study

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This DataONE OpenWetWare site contains informal notes for several research projects funded through DataONE. DataONE is a collaboration among many partner organizations, and is funded by the US National Science Foundation (NSF) under a Cooperative Agreement.

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THIS PROJECT IS MID-DEVELOPMENT. RESULTS HERE ARE UNSTABLE, INCOMPLETE, AND PERHAPS WILDLY WRONG. That said, please enjoy your reading in the spirit of Open Notebook Science and I'd love to hear your thoughts and suggestions :)

Contents

Aim

Does the quantity of metadata associated with a dataset correlate with the number of times that dataset is reused?

Is more compete metadata associated with an increased benefit for investigators in the form of increased citations?

Background

Methods

Variables

Dependent variables:

  1. reuses
  2. citations

Independent variables:

  1. ArrayExpress gives its microarray submissions a "MIAME score": number from 0 to five that quantifies whether the data set has an associated array design, protocol, list of factors, processed data, and raw data. Quantitative and fairly objective, if slightly superficial.
  2. We could attempt to account for confounders by including other independent variables for organism, size of the dataset, impact factor of publishing journal, disease of study, etc

Data collection

Downloaded ArrayExpress metadata using custom Python code on July 22, 2009. Open Source: <<link to git>>. (Note the one year gap. This was due to an intervening thesis. Also, updated metadata capture is not necessary because we would be ideally be capturing the metadata that existed at the time reusers would have been searching it... )

Identified ArrayExpress reuse in PubMed Central using the ArrayExpress variant of the DataONE:Protocols/Find_GEO_reuses protocol. Reuses captured on July 19, 2010

Downloaded Scopus citation counts for the PMIDs listed in the ArrayExpress metadata. Collected on July 19, 2010 using the DataONE:Protocols/Scopus_citation_counts_from_PMIDs protocol.

Stats

  • log-linear regression? Or ideally some more sophisticated stats that would account for the censored nature of the data, but I'm not handy with them yet.

Results

  • <<link to ArrayExpress metadata dataset>>
  • <<link to ArrayExpress reuse dataset>>
  • <<link to Scopus data>>

Discussion

Limitations

There are many limitations of this preliminary analysis:

  • nothing about the quality of the metadata
  • direction of causation, or third related concept... maybe higher quality/more useful datasets create more metadata
  • demonstrated reuse is not the only dimension of value. Metadata may not be correlated with increased usage, but it may decrease the amount of time that investigators spend finding the data they need and/or eliminating the data they don't need
  • didn't eliminate same-author reuses of data (in the interests of time... this could be done....) which would presumably be unrelated to metadata content
  • limitation in using these results to direct what metadata to collect: of course the metadata people use today may not be the metadata that will be most useful to scientists 20 years from now

Future work

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