Hi Jordan.
One option is to use the threshold model from quantitative genetics and
estimate the evolutionary correlation/covariance between the binary
trait and the continuous characters. This approach is described in
Felsenstein (2012; Am. Nat.) and implemented in the stand-alone C
program, threshml
(http://evolution.gs.washington.edu/phylip/download/threshml/). I also
recently added a two character version (threshml can analyze an
arbitrary number of binary & continuous traits) of this to phytools,
described on my blog
(http://phytools.blogspot.com/2012/08/bayesian-mcmc-for-threshold-model.html).
If you decide to use phytools, you will have to download the latest
version
(http://faculty.umb.edu/liam.revell/phytools/nonstatic/phytools_0.1-91.tar.gz)
and install from source as this in not in the current CRAN version.
If you look at the blog post linked above you will also see that there
was considerable discussion about whether it was possible to fit the
same model using MCMCglmm.
All the best, Liam
Liam J. Revell, Assistant Professor of Biology
University of Massachusetts Boston
web: http://faculty.umb.edu/liam.revell/
email: liam.rev...@umb.edu
blog: http://phytools.blogspot.com
On 8/29/2012 3:23 PM, Jordan Golubov wrote:
Dear All,
I am trying to test whether a binomial character state (photoblastic
seeds vs indifferent responsive seeds) in species of Cactaceae is
affected by seed mass or length. 1) Is there a meas of identifying
phylogenetic signal for a two character state? 2) Is there a way of
testing what factor (both continuous seed mass/length) affects
photoblastic rersponse, maybe a GLMM?
Thanks
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