# What is the non-parametric equivalent of a two-way ANOVA that can include interactions?

Hi I am trying to find the non-parametric equivalent of a two-way ANOVA (3x4 design) which is capable of including interactions. From my reading in Zar 1984 "Biostatistical analysis" this is possible using a method put forth in Scheirer, Ray, and Hare (1976), however, according to other posts online it was inferred that this method is no longer appropriate (if it ever was).

Does anyone know what method would be appropriate for doing so, and if so the corresponding functions in R or Stata?

• The best choice (if there is any) depends on the reason why you think classic ANOVA is not appropriate in your case. – Michael M Dec 3 '13 at 7:40
• Hi Michael, the classic ANOVA is not appropriate because despite using transformations it is not possible to meet the normality assumption. – user35595 Dec 4 '13 at 18:11

• The vignettes from the ordinal package provide a good introduction to ordinal logistic regression and clm has far more capabilities than the polr command in the MASS package. – John Dec 3 '13 at 0:42