Vanderlei- Negative alpha would imply a detractor, rather than an attractor, similar to what was found by Alroy (1996) in his Cope's Rule paper. Is that the sort of dynamic you wanted to simulate?
I'm not familiar with any discussion of negative alpha values in the literature. -Dave On Wed, Apr 25, 2012 at 1:57 PM, Vanderlei Debastiani <vanderleidebasti...@yahoo.com.br> wrote: > Dear, > > Could I simulate continuous character evolution using a Ornstein-Uhlenbeck > model (Function rTraitCont in the package ape) with a negative alpha value? > > My intention is to simulate trait evolution with different phylogenetic > signal (less or more similar than expected under Brownian motion evolution) > using the K statistic. > > The function works with negative alpha, simulating traits with different K > values, but does it make any sense? > > Thanks, > > Vanderlei Debastiani > Laboratório de Ecologia Filogenética e Funcional > Programa de Pós-Graduação em Ecologia > Universidade Federal do Rio Grande do Sul > www.ufrgs.br/leff > > > > > [[alternative HTML version deleted]] > > > _______________________________________________ > R-sig-phylo mailing list > R-sig-phylo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-phylo > -- David Bapst Dept of Geophysical Sciences University of Chicago 5734 S. Ellis Chicago, IL 60637 http://home.uchicago.edu/~dwbapst/ http://cran.r-project.org/web/packages/paleotree/index.html _______________________________________________ R-sig-phylo mailing list R-sig-phylo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo
