Dear Fabio, In R, there are many of things available... geomorph of course with morphol.disparity.... but also more specific packages: the recent vcvComp package by Lemaitre and Mitteroecker, they implement the relative eigenanalysis of Bookstein and Mitteroecker. not first designed for GM but easily adaptable:dispRity by Guillerme and Puttick. You can also have a look at the paper published by these people...
In terms of more custom but older GM oriented things: You can compare the traces of the variance covariances using a goodall F test strategy and associated degrees of freedom (see for instance Klingenberg et al. 2002 or 1998). Colleagues including myself have been compared traces (using or not permutation strategies), but yet and except vcvComp and relative eigen analysis example provided by Lemaitre and Mitteroecker, I have not seen anyone using a more 'multivariate' strategy for comparing variation among two or more groups. For that maybe also, you can go even more parametric and general by exploring the Hotellingsp function that I wrote for morphometrics in R for comparing variance covariances (p.252, some applications are given p.271, p.275). You should input the group of larger trace instead of the effect, and the one of smaller trace instead of the error (as it was written, the test was one sided)... but as it has not been used yet to my knowledge, maybe people will complain. Julien De: "Fabio Pinheiro" <[email protected]> À: "Morphmet" <[email protected]> Envoyé: Vendredi 18 Novembre 2022 11:37:06 Objet: [MORPHMET2] measuring morphological diversity BQ_BEGIN Dear all Morphmet members I am a professor at Universidade Estadual de Campinas, and we are analysing the geometric morphometrics of different populations of an orchid, including populations distributed along a geographic range. We aim to test the central-periphery hypothesis, which expects lower morphological diversity at the distribution edges. We were able to use MorphoJ at several steps of morphometric analysis, from organizing the landmarks to running PCA, Anova tests etc. However, we are struggling to find out how to measure the morphological diversity of each population. I believe it is something related to a measure of dispersion of the morphological variability of the individuals from one population, comparing to the centroid of the same population. But there are other methods in the literature. Thus, I would like to ask you if MorphoJ could be used to provide a morphological diversity estimate for each population we are analysing. If not, we would be happy with some suggestions for other software/R packages that may help us with this task Thank you for your help Sincerely -- 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 [ mailto:[email protected] | [email protected] ] . To view this discussion on the web visit [ https://groups.google.com/d/msgid/morphmet2/00920ef8-9463-447d-bd37-3f0118828184n%40googlegroups.com?utm_medium=email&utm_source=footer | https://groups.google.com/d/msgid/morphmet2/00920ef8-9463-447d-bd37-3f0118828184n%40googlegroups.com ] . BQ_END -- 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/morphmet2/977390073.5849189.1668828690656.JavaMail.zimbra%40umontpellier.fr.
