Dear R Help list, My question is how sample size is specified in 2-way ANOVA power calculation in the pwr2 package.
In the function pwr2::pwr.2way documentation it gives an example use (source https://rdrr.io/cran/pwr2/man/pwr.2way.html) : ``` ## Example 1 pwr.2way(a=3, b=3, alpha=0.05, size.A=4, size.B=5, f.A=0.8, f.B=0.4) ``` I have trouble understanding what the total sample size is in this case. The documentation says `a` refers to the number of groups in Factor A, and `size.A` is the sample size per group in Factor A. Similarly for Factor B. Based on that, I inferred that Factor A is supposed to have 3 groups with 4 individuals per group, meaning a total of 12 individuals in the experiment as a whole. However, in Factor B there are 3 groups with 5 individuals per group, which would lead to a total of 15 individuals. So my conclusions are contradictory: are there 12 or 15 individuals in this experimental design? Or yet a different number? Any help appreciated. Best wishes Floris [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
