Using Nonexperimental Methods to Address Noncompliance

Daniel Litwok
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Daniel Litwok: Abt Associates

No 20-324, Upjohn Working Papers from W.E. Upjohn Institute for Employment Research

Abstract: The analysis compares estimates of the incremental impact for those who receive HPOG with a program enhancement to the standard HPOG program. The experimental benchmark for the incremental impact comes from two-stage least squares with random assignment as an instrumental variable for enhancement take-up. Then, ignoring the randomly assigned conditions, the analysis estimates the counterfactual for those who “take up” the enhancement using ordinary least squares and inverse propensity weighting. The analysis also tests whether adding information that is only available due to the experiment—who complied with their randomization status and who did not—improves the nonexperimental estimates. The analysis compares these estimates using statistical tests recommended by the within-study comparison literature.

Keywords: Treatment effects; Experimental methods; Nonexperimental methods; Within-study comparison (search for similar items in EconPapers)
JEL-codes: C31 J24 (search for similar items in EconPapers)
Date: 2020-04
New Economics Papers: this item is included in nep-exp
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