Dear list users, I'm interested in testing for phylogenetic signal in a trait of parasites: the number of host species a parasite infects. I have a phylogeny for the parasites and I have tabulated the number of host species each parasite infects from the literature. However, some parasites are well sampled (estimates from 20+ studies) and many are poorly sampled (estimates from one study). So I would like to incorporate sampling error into the calculation.
I know that the phylosig function in phytools can do this, but it's not clear to me how to estimate appropriate standard errors for these data. In the literature, people have dealt with this by testing for phylogenetic signal in the residuals of a regression between number of host species a parasite infects and the number of studies of the parasite. I'm wondering if there is another way to go about it, perhaps by weighting species by sample size in the calculation of phylogenetic signal. Does anyone know of a way to do something like this? Or do you think my best bet is to just work with the residuals from a regression with sample size? Thanks for any feedback! Vincenzo [[alternative HTML version deleted]] _______________________________________________ R-sig-phylo mailing list - Rfirstname.lastname@example.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo Searchable archive at http://email@example.com/