Published by the Foundation for Open Access Statistics Editors-in-chief: Bettina Grün, Torsten Hothorn, Edzer Pebesma, Achim Zeileis    ISSN 1548-7660; CODEN JSSOBK
Authors: Masahiko Gosho
Title: Criteria to Select a Working Correlation Structure in SAS
Abstract: The generalized estimating equations (GEE) method is popular for analyzing clustered and longitudinal data. It is important to determine a proper working correlation matrix when applying the GEE method since an improper selection sometimes results in inefficient parameter estimates. In this paper, we provide the CriteriaWorkCorr macro in SAS to calculate the criteria proposed by Pan (2001), Hin, Carey, and Wang (2007), Hin and Wang (2009), and Gosho, Hamada, and Yoshimura (2011) for selecting the working correlation structure when the GEE method is applied. We illustrate the implementation and an example of the macro.

Page views:: 5099. Submitted: 2011-10-25. Published: 2014-03-13.
Paper: Criteria to Select a Working Correlation Structure in SAS     Download PDF (Downloads: 13443)
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CriteriaWorkCorr.sas: SAS source code Download (Downloads: 549; 21KB)
v57c01.sas: Replication code and data from the paper Download (Downloads: 467; 1KB)

DOI: 10.18637/jss.v057.c01

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Paper: Creative Commons Attribution 3.0 Unported License
Code: GNU General Public License (at least one of version 2 or version 3) or a GPL-compatible license.