Re: [R-sig-eco] different result for permutest (vegan, R) and permdisp (PERMANOVA/Primer)

2016-11-28 Thread Cade, Brian
Ellen: Not sure why these differences would occur but note that with two groups of 3 observations each there are only 6!/(3!3!) = 20 possible permutations. Not sure where your 720 came from. Also, I would not expect a permutation test for homogeneity of dispersions to be very useful with such

[R-sig-eco] different result for permutest (vegan, R) and permdisp (PERMANOVA/Primer)

2016-11-23 Thread Ellen Pape
Dear all, As I want to switch for my multivariate data analyses from PRIMER/PERMANOVA to R, I am comparing all tests I am doing in the former with those performed in the latter program, to see whether results agree. I performed a test for the homogeneity of multivariate dispersions in both