GEEPERs: Principal Stratification using Principal Scores and Stacked Estimating Equations

12/20/2022
by   Adam C Sales, et al.
0

Principal stratification is a framework for making sense of causal effects conditioned on variables that themselves may have been affected by treatment. Most principal stratification estimators rely on strong structural or modeling assumptions, and many require advanced statistical training to fit and to check. In this paper, we introduce a new M-estimation principal effect estimator for one-way noncompliance based on a binary indicator. Estimates may be computed using conventional regressions (though the standard errors require a specialized sandwich formula) and do not rely on distributional assumptions. We illustrate the new technique in an analysis of student log data from a recent educational technology field experiment.

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