This article corrects:

  1. Cutoff designs for community-based intervention studies Volume 30, Issue 15, 1865–1882, Article first published online: 17 April 2011

I would like to report an erratum to the paper entitled ‘Cutoff Designs for Community-Based Intervention Studies’ by Pennell, Hade, Murray, and Rhoda, Statistics in Medicine. In the proof given in the Appendix, the expression for E(Y  | Z,X) should be as follows:

display math

which simplifies to

display math

because W is independent of Z conditional on X. The validity of the proof is unaffected by the correction.