Correct. If a user wishes to adjust for multiple comparisons they may do so post-hoc.
Dean Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ From: [email protected] <[email protected]> on behalf of Ian Dworkin <[email protected]> Sent: Monday, May 25, 2026 8:23:53 AM To: [email protected] <[email protected]> Cc: Morphmet <[email protected]> Subject: Re: [MORPHMET2] Should multiple comparisons with pairwise() have p-value adjustments? 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]<mailto:[email protected]> <[email protected]<mailto:[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]<mailto:[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]<mailto:[email protected]> dworkinlab.github.io<http://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]<mailto:[email protected]>. To view this discussion visit https://groups.google.com/d/msgid/morphmet2/CAGudrj%3DZLnucD8G3k5qDFXzKjWBZrdWg_bX5z9Q90Pt90-hNCQ%40mail.gmail.com<https://groups.google.com/d/msgid/morphmet2/CAGudrj%3DZLnucD8G3k5qDFXzKjWBZrdWg_bX5z9Q90Pt90-hNCQ%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- 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/SJ0PR04MB8306C65371B0A563EF9D6228A20A2%40SJ0PR04MB8306.namprd04.prod.outlook.com.
