Re: [R-sig-phylo] Sampling bias in discrete trait estimation

2013-11-11 Thread Luiz Max Carvalho
This definitely looks like something. Thanks, Matt! Cheers, Luiz 2013/11/11 Matt Pennell > Hi Luiz, > > > Yes, non-random sampling of traits, if not taken into account will > certainly bias the estimation of the transition parameters. Methods for > addressing this have been developed by Rich

Re: [R-sig-phylo] Sampling bias in discrete trait estimation

2013-11-11 Thread Matt Pennell
Hi Luiz, Yes, non-random sampling of traits, if not taken into account will certainly bias the estimation of the transition parameters. Methods for addressing this have been developed by Rich FitzJohn and colleagues http://sysbio.oxfordjournals.org/content/58/6/595.short (this was discussed in th

[R-sig-phylo] Sampling bias in discrete trait estimation

2013-11-11 Thread Luiz Max Carvalho
Dear all, Suppose you have observed K discrete traits for a phylogeny with N tips. For some reason, you think your trait sampling is not random, i.e., it may be biased towards some particular K's, for example because they're easier to sample. I imagine this will introduce some bias in the estima