HI Vera, pairwise() in geomorph/RRPP does not do any adjustments. The last I spoke to Mike and Dean about (when I prepped an online seminar about it during the pandemic... so a while ago), it was in part because it provides ALL pairwise comparisons. One of the things I point out to people using it, is that you need to *a priori *plan which you are going to use, and do your adjustments based upon that.
Cheers Ian On Mon, 25 May 2026 at 06:33, [email protected] < [email protected]> wrote: > Hi everyone, > > I was recently asked if I implement any multiple comparison adjustments > (like Holm) when using the pairwise() function in geomorph on RRPP-based > procD.lm/procD.pgls fits involving a factor with more than two levels. I > admit that this never crossed my mind, but I can’t see why there should not > be a higher risk of getting false H0 rejections with increasing > comparisons, as it would in other multiple comparison contexts. > > It is easy to do an adjustment manually, but I do not think I have seen it > done anywhere – it is not part of the pairwise implementation as far as I > can see, and I did not spot a comment on it in the Collyer & Adams 2018 > paper on RRPP. I was wondering if there is a reason for this, perhaps > related to the residual randomisation procedure or building of confidence > intervals? > Thanks a lot for any suggestions! > > Vera > > -- > You received this message because you are subscribed to the Google Groups > "Morphmet" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/morphmet2/cdfd532c-084e-4dbd-bc7a-190f6808ed2cn%40googlegroups.com > <https://groups.google.com/d/msgid/morphmet2/cdfd532c-084e-4dbd-bc7a-190f6808ed2cn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Ian Dworkin Department of Biology McMaster University Office phone 905 525 9140 ext. 21775 Lab phone 905 525 9140 ext. 20076 [email protected] dworkinlab.github.io -- You received this message because you are subscribed to the Google Groups "Morphmet" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/morphmet2/CAGudrj%3DZLnucD8G3k5qDFXzKjWBZrdWg_bX5z9Q90Pt90-hNCQ%40mail.gmail.com.
