r - Vegan: Number of significant axes in RDA -


i have data frame of phytocoenological relevés, rows sites , columns species. run rda on , want site scores on significant axes.

how know, how many axis of rda.spe model significant?

personally there no way. however, people have suggested ways find number of non-significant axes. of these discussed in vegan github issue. personal experience many of these ways work poorly: if generate data defined number of dimensions + random error, methods fail find known number of axes. many of these methods easy-ish implement (although have not implemented them in vegan), though. see discussion linked above.

your title asks pcoa, example uses rda. however, similar methods apply both (or fail both think).


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