Re: [R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-09 Thread New Bio
Thanks, Liam. good to know. I think extending the tools to analyze traits of ordered/unordered multistates can be very useful. There are many interesting traits such as oxygent requirement (anaerobic, facultative, aerobic) of microbes, which is ordered multistates, and habitats (water, air, soil),

Re: [R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-09 Thread Joe Felsenstein
New Bio wrote: Thanks, Liam. good to know. I think extending the tools to analyze traits of ordered/unordered multistates can be very useful. There are many interesting traits such as oxygent requirement (anaerobic, facultative, aerobic) of microbes, which is ordered multistates, and

Re: [R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-09 Thread Liam J. Revell
Thanks for clarifying this, Joe. My function for ancestral character estimation under the threshold model (ancThresh) allows multistate data - but the order of the states along the liability axis needs to be specified a priori by the user.** The relative positions of the thresholds are

Re: [R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-08 Thread Liam J. Revell
Hi Peter. I'm not sure if this is what you mean, but Felsenstein (2005, 2012) has a method for estimating the correlation between discrete characters or a discrete and a continuous character in which the discrete trait is modeled using the threshold model from quantitative genetics. There is

Re: [R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-08 Thread Liam J. Revell
Peter - I realized that this is not very clear. Threshml can analyze multiple continuous discrete characters, but the discrete characters must be binary. threshBayes has the same limitation, but is also limited to only two traits (binary-binary, binary-continuous, or continuous-continuous). -

[R-sig-phylo] statistically test whether two characters evolve dependently

2013-04-07 Thread New Bio
Dear all, Just started studying phylogeny. I know BayesTraits program can calculate the likelihood of the observed data given the model of two charaters evolve dependently or independently. I am wondering how to do it with R packages or functions for discrete and continuous characters? Best,