Comparative Regression Discontinuity: A Stress Test With Small Samples

Evaluation Review
Yasemin Kisbu-SakaryaM H Clark

Abstract

Compared to the randomized experiment (RE), the regression discontinuity design (RDD) has three main limitations: (1) In expectation, its results are unbiased only at the treatment cutoff and not for the entire study population; (2) it is less efficient than the RE and so requires more cases for the same statistical power; and (3) it requires correctly specifying the functional form that relates the assignment and outcome variables. One way to overcome these limitations might be to add a no-treatment functional form to the basic RDD and including it in the outcome analysis as a comparison function rather than as a covariate to increase power. Doing this creates a comparative regression discontinuity design (CRD). It has three untreated regression lines. Two are in the untreated segment of the RDD-the usual RDD one and the added untreated comparison function-while the third is in the treated RDD segment. Also observed is the treated regression line in the treated segment. Recent studies comparing RE, RDD, and CRD causal estimates have found that CRD reduces imprecision compared to RDD and also produces valid causal estimates at the treatment cutoff and also along all the rest of the assignment variable. The present study seeks t...Continue Reading

References

Jan 24, 2009·Journal for Specialists in Pediatric Nursing : JSPN·Paul F Cook
May 4, 2011·Psychological Methods·William R ShadishThomas D Cook

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Citations

Oct 16, 2018·Evaluation Review·Vivian C WongKylie L Anglin
Jun 30, 2018·Evaluation Review·Vivian C Wong, Peter M Steiner

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Software Mentioned

Pre
Pre LATE
RDD
RE
RE LATE
LOWESS
CRD
LATE
CG

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