Also worth noting is that people often use taxonomic levels if they don't
have a tree. Trees are more available than might be expected (though still
far less available than they should be), so you can get a tree and use
phylogenetic comparative methods.
Sources of trees:
Oscar Inostraza --
Is the variable x also evolving on the tree? If so you need to use
standard phylogenetically-informed comparative methods to estimate the
variances and covariances of changes in both characters.
You may not be able to assume that y responds instantly to x.
J.F.
Joe
Hi, everybody
I’m trying to fit a phylogenetic model to model the relationship between x
and y (eg. lmer syntax: y~x +(1|species), species with their respective
var-covar matrix). Given that species are grouped into major categories
(families, orders, etc), What is the correct way to account for
