Re: [R-sig-phylo] caper model comparison with different branch length transformations

2014-08-20 Thread Sereina Graber
, 20. August 2014 um 17:11 Uhr Von: "Liam J. Revell" An: "Sereina Graber" , r-sig-phylo@r-project.org Betreff: Re: [R-sig-phylo] caper model comparison with different branch length transformations Hi Sereina. Why lambda=0.5? Normally investigators tend to compare a model where lambd

Re: [R-sig-phylo] caper model comparison with different branch length transformations

2014-08-20 Thread Liam J. Revell
Hi Sereina. Why lambda=0.5? Normally investigators tend to compare a model where lambda is estimated to one in which it is fixed at 1 which corresponds to Brownian evolution; or 0 which corresponds to no phylogenetic correlation in the residual error of the model. We can compare two fitted m

[R-sig-phylo] caper model comparison with different branch length transformations

2014-08-20 Thread Sereina Graber
Dear all,   I have a question conserning the pgls regression in package caper. The function allows to estimate or fix three branch length transformations. I wanna figure out which transformation gives me the best model fit by comparing for example a model with lambda estimated (lambda="ML") to a