No, they are the same.
The difference between GLS and OLS is only in the specified (assumed)
variance-covariance matrix of the residuals.
Cheers
Ted
P.S. "PGLS" can be viewed as costing 1 df if you estimate a branch length
transformation parameter.
On Fri, Jun 11, 2021, 9:54 PM Russell Engelman
Dear R-Sig-Phylo Group,
I had a question regarding the calculation of regression statistics using
PGLS. When I obtain the degrees of freedom from a PGLS object using ape in
R, I notice that it returns the same number of degrees of freedom as under
OLS, and the AIC of a bivariate function is
