====== Statistical power for a mixed model of repeated measures with a general structure ======

The calculation is based on the method described in Lu, Luo, & Chen (2008) Formula (3) on page 4 and the R function power.mmrm of the package longpower (Donohue & Edland, 2013).

===== References =====
  * Donohue, M. C., & Edland, S. D. (2013). longpower: Power and sample size calculators for longitudinal data. R package version 1.0-10.
  * Lu, K., Luo, X., Chen, P.-Y. (2008) Sample size estimation for repeated measures analysis in randomized clinical trials with missing data. //International Journal of Biostatistics, 4//, (1)