Handling attrition in longitudinal studies: The case for refreshment samples

@article{Deng2013HandlingAI,
  title={Handling attrition in longitudinal studies: The case for refreshment samples},
  author={Yiting Deng and D. Sunshine Hillygus and Jerome P. Reiter and Yajuan Si and Siyu Zheng},
  journal={Quality Engineering},
  year={2013},
  volume={59},
  pages={197-200}
}
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… 

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