Primary Submission Category: Regression Discontinuity
Blessing of Multiple Control Groups in Fuzzy Regression Discontinuity Designs: Evaluating Extended Time Accommodations
Authors: Youmi Suk, Yongnam Kim,
Presenting Author: Youmi Suk*
Regression discontinuity (RD) designs have become popular for evaluating the effectiveness of policies and programs, and in particular, fuzzy RD designs are often employed in the presence of noncompliance. While recent advancements have combined RD designs with other quasi-experimental designs, there is limited research on enhancing RD designs with multiple control groups. This paper proposes a novel approach to combining fuzzy RD designs and multiple control group designs under one-sided noncompliance. We estimate the average treatment effect on the treated (ATT) at the cutoff from the fuzzy RD design under one-sided noncompliance and construct its bounds derived from multiple control groups. Using the bounds as a sensitivity check, we examine whether the underlying causal or statistical assumptions for the fuzzy RD design are warranted. Finally, we demonstrate our approach by studying the effect of extended time accommodations using data from the National Assessment of Educational Progress.