Hi Sergio.
We don't expect the residuals from PGLS to be independent draws from a
normal distribution, but multivariate normal with a correlation
structure given by the tree.
Here I give some more explanation of this on my blog:
Hello,
Thank you very much for the answer. I assumed PGLS residuals had to be
normal (I saw this thread:
https://stat.ethz.ch/pipermail/r-sig-phylo/2012-May/002064.html). In fact,
what I'm analysing are standardized residuals (standardized by setting the
determinant of the covariance matrix equal
[sff.card...@campus.fct.unl.pt]
Sent: Saturday, April 18, 2015 10:59 AM
To: Liam J. Revell
Cc: r-sig-phylo@r-project.org
Subject: Re: [R-sig-phylo] Non normal PGLS results
Hello,
Thank you very much for the answer. I assumed PGLS residuals had to be
normal (I saw this thread:
https://stat.ethz.ch
Dear all,
I'm performing PGLS's with an ultrametric phylogenetic tree (divergence
time as branchlengths). I tied Pagel's Lambda transformation, OU
transformation, regular GLS and OLS, to compare results. There is one
problem: the residuals of my analyses are not normal. I tried to remove big
...@campus.fct.unl.pt]
Sent: Saturday, April 18, 2015 10:59 AM
To: Liam J. Revell
Cc: r-sig-phylo@r-project.org
Subject: Re: [R-sig-phylo] Non normal PGLS results
Hello,
Thank you very much for the answer. I assumed PGLS residuals had to be
normal (I saw this thread:
https://stat.ethz.ch
