Comment on “Wang et al. (2005), Robust estimating functions and bias correction for longitudinal data analysis”

Nicola Lunardon and Giovanna Menardi

Biometrics, 2020, vol. 76, issue 3, 1040-1042

Abstract: This note provides a discussion on the manuscript by Wang et al. (2005) who aim to robustify inference for longitudinal data analysis by replacing the ordinary generalized estimating function with an influence‐bounded, possibly biased, version. To adjust for the bias of the ensuing robust estimator, the authors provide its analytic approximation by means of asymptotic expansions, and estimate it by plugging‐in a nonrobust estimate of the parameter of interest. In this letter, we argue that the proposed bias‐corrected estimator is, in fact, nonrobust.

Date: 2020
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