Kreidler, Sarah M., Keith E. Muller, Gary Grunwald, Brandy M. Ringham, Zacchary T. Coker-Dukowitz, Uttara R. Sakhadeo, Anna E. Barón, and Deborah H. Glueck. 2013. “GLIMMPSE: Online Power Computation for Linear Models With and Without a Baseline Covariate”. Journal of Statistical Software 54 (10):1-26. https://doi.org/10.18637/jss.v054.i10.