[R] Why can repeated measures anova with within & between subjects design not be done if group sizes are unbalanced?

2007-11-04 Thread Gilbert G
Dear R people: I wish to switch from SPSS to R, but there is one particular type of ANOVA design that cannot be done in R. Or more likely, it can be done, but it is nowhere documented. The problem is typical for psychologists: You have a repeated measures design with different groups of subjects

[R] how to run a mixed design ANOVA with repeated measures

2007-09-11 Thread Gilbert G
Hi, I would like to run an ANOVA with repeated measures with both a between subjects variable and within subjects (repeated measures) variables. I know how to do this when I have equal numbers of subjects in both groups (i.e., balanced design). That has been very well documented by Baron, for exa