
Hello!
My data has one between-subject factor ("group", 2 levels, n=10 per group) and one within-subject factor ("session", 2 levels). 
I am mainly interested in the interaction between group and session.Because of the small sample size (n=20 cases in total, 10 per group), I though I should use a non-parametric test. 
However, did I understand right that there doesn't exist any non-parametric mixed factorial ANOVA in R?
Thanks a lot in advance!
Marianne 		 	   		  
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