Online Supplement to "Accuracy in parameter estimation for ANCOVA and ANOVA contrasts: Sample size planning via narrow confidence intervals"

This supplement to Lai and Kelley (2012) provides a brief documentation of the R functions and demonstrates the methods in the article with an empirical example. For more information see Lai, K., & Kelley, K. (2012). Accuracy in parameter estimation for ANCOVA and ANOVA contrasts: Sample size planning via narrow confidence intervals. _British Journal of Mathematical and Statistical Psychology_, _65_, 350-370.