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More Powerful Cluster Randomized Controlled Trials

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  • Brendon McConnell
  • Marcos Vera-Hernández

Abstract

Balanced experimental designs, in which the number of treatment units and the number of control units are the same, do not maximize power subject to a cost constraint when treatment units are more expensive than control units. Despite this, such balanced designs are the norm in economics. This paper describes methods to optimally choose the number of treatment and control clusters and the number of units within treatment and control clusters, allowing for full flexibility. We use three archetypal examples from the development literature to illustrate the magnitude of the power gains, which lie between 7.9 and 19.0 percentage points.

Suggested Citation

  • Brendon McConnell & Marcos Vera-Hernández, 2026. "More Powerful Cluster Randomized Controlled Trials," Economic Development and Cultural Change, University of Chicago Press, vol. 74(4), pages 1411-1436.
    • Handle: RePEc:ucp:ecdecc:doi:10.1086/739610
    DOI: 10.1086/739610
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