Open Access
May 2013 Handling Attrition in Longitudinal Studies: The Case for Refreshment Samples
Yiting Deng, D. Sunshine Hillygus, Jerome P. Reiter, Yajuan Si, Siyu Zheng
Statist. Sci. 28(2): 238-256 (May 2013). DOI: 10.1214/13-STS414


Panel studies typically suffer from attrition, which reduces sample size and can result in biased inferences. It is impossible to know whether or not the attrition causes bias from the observed panel data alone. Refreshment samples—new, randomly sampled respondents given the questionnaire at the same time as a subsequent wave of the panel—offer information that can be used to diagnose and adjust for bias due to attrition. We review and bolster the case for the use of refreshment samples in panel studies. We include examples of both a fully Bayesian approach for analyzing the concatenated panel and refreshment data, and a multiple imputation approach for analyzing only the original panel. For the latter, we document a positive bias in the usual multiple imputation variance estimator. We present models appropriate for three waves and two refreshment samples, including nonterminal attrition. We illustrate the three-wave analysis using the 2007–2008 Associated Press–Yahoo! News Election Poll.


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Yiting Deng. D. Sunshine Hillygus. Jerome P. Reiter. Yajuan Si. Siyu Zheng. "Handling Attrition in Longitudinal Studies: The Case for Refreshment Samples." Statist. Sci. 28 (2) 238 - 256, May 2013.


Published: May 2013
First available in Project Euclid: 21 May 2013

zbMATH: 1331.62135
MathSciNet: MR3112408
Digital Object Identifier: 10.1214/13-STS414

Keywords: Attrition , imputation , missing , panel , survey

Rights: Copyright © 2013 Institute of Mathematical Statistics

Vol.28 • No. 2 • May 2013
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