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Computes power, or sample size or the detectable difference for a repeated measures model with attrition. It requires the variance covariance matrix of the observations but can compute this matrix for several common random effects models. See Diggle, P, Liang, KY and Zeger, SL (1994, ISBN:9780198522843).
Package details 


Author  David A. Schoenfeld 
Maintainer  David A. Schoenfeld <Dschoenfeld@mgh.harvard.edu> 
License  Unlimited 
Version  0.1.1 
Package repository  View on CRAN 
Installation 
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