POWERLIB: SAS/IML Software for Computing Power in Multivariate Linear Models.
J Stat Softw. 2009 Apr 1;30(5):http://www.jstatsoft.org/v30/i05. doi: 10.18637/jss.v030.i05.
J Stat Softw. 2009.
PMID: 25400516
Free PMC article.