Blitstein, Jonathan L.; Murray, David M.; Hannan, Peter J. - In: Evaluation Review 29 (2005) 3, pp. 268-286
This article builds on the previous article by Blitstein et al. (2005), which showed how external estimates of intraclass correlation can be used to improve the precision for the analysis of an existing group randomized trial. The authors extend that work to sample size estimation and power...