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Research Article

Reconceptualizing the classification of PNAS articles

Edoardo M. Airoldi, Elena A. Erosheva, Stephen E. Fienberg, Cyrille Joutard, Tanzy Love, and Suyash Shringarpure
PNAS December 7, 2010 107 (49) 20899-20904; https://doi.org/10.1073/pnas.1013452107
Edoardo M. Airoldi
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Elena A. Erosheva
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Stephen E. Fienberg
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  • For correspondence: fienberg@stat.cmu.edu
Cyrille Joutard
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Tanzy Love
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Suyash Shringarpure
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  1. Contributed by Stephen E. Fienberg, October 8, 2010 (sent for review August 6, 2009)

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Abstract

PNAS article classification is rooted in long-standing disciplinary divisions that do not necessarily reflect the structure of modern scientific research. We reevaluate that structure using latent pattern models from statistical machine learning, also known as mixed-membership models, that identify semantic structure in co-occurrence of words in the abstracts and references. Our findings suggest that the latent dimensionality of patterns underlying PNAS research articles in the Biological Sciences is only slightly larger than the number of categories currently in use, but it differs substantially in the content of the categories. Further, the number of articles that are listed under multiple categories is only a small fraction of what it should be. These findings together with the sensitivity analyses suggest ways to reconceptualize the organization of papers published in PNAS.

  • text analysis
  • hierarchical modeling
  • Monte Carlo Markov chain
  • variational inference
  • Dirichlet process

Footnotes

  • Author contributions: E.M.A., E.A.E., S.E.F., C.J., and T.L. designed research; E.M.A., E.A.E., S.E.F., C.J., T.L., and S.S. performed research; E.M.A., E.A.E., S.E.F., C.J., T.L., and S.S. contributed new reagents/analytic tools; E.M.A., E.A.E., S.E.F., C.J., T.L., and S.S. analyzed data; and E.M.A., E.A.E., S.E.F., C.J., and T.L. wrote the paper.

  • The authors declare no conflict of interest.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1013452107/-/DCSupplemental.

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Reconceptualizing the classification of PNAS articles
Edoardo M. Airoldi, Elena A. Erosheva, Stephen E. Fienberg, Cyrille Joutard, Tanzy Love, Suyash Shringarpure
Proceedings of the National Academy of Sciences Dec 2010, 107 (49) 20899-20904; DOI: 10.1073/pnas.1013452107

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Reconceptualizing the classification of PNAS articles
Edoardo M. Airoldi, Elena A. Erosheva, Stephen E. Fienberg, Cyrille Joutard, Tanzy Love, Suyash Shringarpure
Proceedings of the National Academy of Sciences Dec 2010, 107 (49) 20899-20904; DOI: 10.1073/pnas.1013452107
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