[R-sig-phylo] comparing rates of evolution of a phenotypic trait among clades

2017-07-22 Thread Karla Shikev
Dear all, I'd like to test whether the rate of evolution of a phenotypic trait (e.g. body size) is significantly different among distantly-related clades (e.g. mammals vs birds). I got tip data and completely resolved and callibrated trees. One possibility would be to estimate rates and their conf

Re: [R-sig-phylo] comparing rates of evolution of a phenotypic trait among clades

2017-07-22 Thread Liam J. Revell
Hi Karla. phytools has a function called ratebytree for this. This essentially corresponds to the 'censored' model of O'Meara et al. 2006, but we also have a submitted manuscript describing it. I can send you that in a second email. For more information about using the function you can searc

Re: [R-sig-phylo] comparing rates of evolution of a phenotypic trait among clades

2017-07-22 Thread Karla Shikev
Thanks, Liam! Just a quick follow-up question: in the example I saw on your webpage (with three clades, one of which with a higher rate), how would you go about a sort of "post-hoc" test to determine which clades differ significantly from one another in their rates? Karla On Sat, Jul 22, 2017 at

Re: [R-sig-phylo] comparing rates of evolution of a phenotypic trait among clades

2017-07-22 Thread Liam J. Revell
Hi Karla. This is not yet possible, but it would be straightforward to add. For instance, we could let the user specify different models such as A==B!=C vs. A!=B==C and so on, and then compare this models in a standard way. I will try to do this soon and then get back to you & the list. All