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The rationale is given in inter alia Anderson & Walsh (2013) For the other part of your question, perhaps ask on StackOverflow or the person who wrote the code you are trying to modify? |
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Here you find the pairwise adonis: https://github.com/pmartinezarbizu/pairwiseAdonis and here a discussion about it: https://www.researchgate.net/post/How_can_I_do_PerMANOVA_pairwise_contrasts_in_R. |
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I am very new to vegan package. I wonder what the funcion betadisper aims for? Since the help(betadisper) pointed out that the betadisper is a multivariate analogue of Levene's test for homogeneity of variances. Do I need to perform this function before the PERMANOVA with the function adonis().It looks like this was not seen in other cases as far as I know. I really feel confused.
In addition, I wanna to know how to dopairwise comparison for PERMANOVA, if the factor was two kinds of grouping variables. How to fix the the code as I copied from the net. factors=list(var1,var2) does not work.
Much thanks
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