Discussion of "Generalized Estimating Equations: Notes on the Choice of the working Correlation Matrix"

J. Breitung, N. R. Chaganty, R. M. Daniel, M. G. Kenward, M. Lechner, P. Martus, R. T. Sabo, Y. G. Wang, C. Zorn

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Objective: To discuss generalized estimating equations as an extension of generalized linear models by commenting on the paper of Ziegler and Vens "Generalized Estimating Equations: Notes on the Choice of the Working Correlation Matrix". Methods: Inviting an international group of experts to comment on this paper. Results: Several perspectives have been taken by the discussants. Econometricians have established parallels to the generalized method of moments (GMM). Statisticians discussed model assumptions and the aspect of missing data. Applied statisticians commented on practical aspects in data analysis. Conclusions: In general, careful modeling correlation is encouraged when considering estimation efficiency and other implications, and a comparison of choosing instruments in GMM and generalized estimating equations (GEE) would be worthwhile. Some theoretical drawbacks of GEE need to be further addressed and require careful analysis of data. This particularly applies to the situation when data are missing at random.

Original languageEnglish (US)
Pages (from-to)426-432
Number of pages7
JournalMethods of Information in Medicine
Issue number5
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Health Informatics
  • Advanced and Specialized Nursing
  • Health Information Management


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