Dear Priya,
Simon Blomberg posted on this back in 2008:
https://stat.ethz.ch/pipermail/r-sig-phylo/2008-June/000128.html
His point is that scaling the variables before the analysis using their simple
standard deviations doesn�t correctly account for the phylogenetic structure. I
think there
Hi David Priya.
To do what David suggests, you probably want all your variables to each
have 'phylogenetic mean' of zero 'phylogenetic variance' of 1.0. This
is pretty easy. Just do the following, which assumes that your data are
in n x m matrix (for n species m variables) X, and your
Dear list members
I am learning to do a phylogenetic generalized least squares analysis in
Caper and Ape. I was wondering if anyone knows how to get standardized
coefficients from a pgls analysis in Caper and/or Ape? Do the input
variables have to be standardized first or is there another way
