Hi Sergio,
I am not quite understanding the situation nor why you see a problem. if I
understand correctly, you are considering these five (5) alternative models for
some sort of simple or multiple regression:
OLS = star phylogeny
PGLS with real-time branch lengths (ultrametric)
Pagel's
Agreed!
Similarly, Pagel's lambda ad Grafen's rho were designed from a purely
statistical perspective, whereas OU and ACDC models are motivated by ties to a
possible set of biological processes.
Cheers,
Ted
From: Alejandro Gonzalez Voyer [alejandro.gonza...@iecologia.unam.mx]
Sent: Thursday,
Hello all,
I have an ultrametric phylogenetic tree with divergence times as branch
lengths. To see if there was a big difference between using these branch
lengths and equal (=1) branch lengths I set all lengths to 1 and ran a
PGLS. I ran with Lambda transformations and the estimation is that