Dear All, Rebeka's question on P values gives me a chance to suggest a reading (out now in TREE): https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(21)00284-6 I am not convinced that a change in the language is the simple solution to the misinterpretation of P values, but they have a point (a bit 'postmodernist', a colleague said) and a very balanced view on the pros and cons of statistical significance testing.
Another really nice paper that came out in the same journal may be of interest to all those who, like me, work on museum data: https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(21)00221-4 Some of their points have been made by others (including in my paper https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24397) but they cover the issues much better and more broadly. All the best Andrea On Mon, 29 Nov 2021 at 21:11, Rebeka Rmoutilová <[email protected]> wrote: > Hi! > > I have shape data with groups by sex and age (young, middle and old). I > used procSym function to perform Procrustes ANOVA on the data and now I > want to use a post-hoc test to find which groups are different. Totally, > there is 15 combinations of sex and age groups, but I am interested only in > some of the comparisons to find whether there is sexual dimorphism inside > the age groups or whether the age groups differ within males or females. So > for example, I am not interested whether there is a difference between > young males and old females which leads to only 9 comparisons. > > There are two functions I could probably use: permudist in Morpho package > and pairwise in RRPP package. Both functions compute differences between > all possible pairs of groups applying a stricter p value correction than if > I make only the 9 comparisons. Can I test the differences with one of those > functions without any p value correction and then correct it for 9 > comparisons using the p.adjust function? I see that at least in the > permudist function, it is possible to use no adjustment method, but I am > not sure whether it is a correct approach. Additionally, is it necessary to > use p value correction when I use permutations in the permudist function? > > Rebeka > > -- > 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 on the web visit > https://groups.google.com/d/msgid/morphmet2/8450baec-0ec3-4b1f-be42-ed6fef8ab811n%40googlegroups.com > <https://groups.google.com/d/msgid/morphmet2/8450baec-0ec3-4b1f-be42-ed6fef8ab811n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Dr. Andrea Cardini Researcher, Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy tel. 0039 059 4223140 Dr. Andrea Cardini Researcher, Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy tel. 0039 059 4223140 Adjunct Associate Professor, Centre for Forensic Anthropology, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia E-mail address: [email protected], [email protected] WEBPAGE: https://sites.google.com/view/alcardini2/ or https://tinyurl.com/andreacardini FREE Yellow BOOK on Geometric Morphometrics: https://tinyurl.com/yellowmorphobook -- 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 on the web visit https://groups.google.com/d/msgid/morphmet2/CAJ__j7OCkKPvaTF0gdHhw%2B0x5ayLzjaVmZsudgNUqz%2BUmAEkYw%40mail.gmail.com.
