Abstract
We congratulate Imai, King and Nall on a valuable paper which will help to improve the design and analysis of cluster randomized studies. Imai et al. make two key contributions: (1) they propose a design-based estimator for matched pair cluster randomized studies that in many circumstances is a better estimator than the harmonic mean estimator; (2) they present convincing evidence that the matched pair design, when accompanied with good inference methods, is more powerful than the unmatched pair design and should be used routinely.
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