Dear Florian, A K values of 0.041 is very small. It is hard for me to imagine that the randomizaton test for the presence of phylogenetic signal (Blomberg et al. 2003), which is based on the MSE not K, is significant. I cannot vouch for what those R packages are doing. I would suggest that you get the authors of those packages to run your data for you and see what's up.
sincerely, Ted On Thu, Dec 1, 2016 at 1:41 AM, Menzel, Dr. Florian <menz...@uni-mainz.de> wrote: > Dear Ted, > > yes. I have a trait with K = 0.041. According to randomization tests, K > differs from the random expectation (p= 0.001; test from Blomberg et al. > 2003, computed with 'phylosig' from the phylosig package) AND from the > expectation under a Brownian Motion model (also p=0.001; simulated using > 'brownie.lite'/'paintSubTree'). I had similar results for some more > traits. > > Does this mean that there is less phylogenetic signal than expected under > Brownian Motion, but more than expected at random? Or does it mean that the > trait evolves even faster than expected at random, i.e. that closely > related taxa differ more than expected from random? > > Thanks a lot! > > Florian > > Dr. Florian Menzel > Department of Evolutionary Biology, Institute of Zoology > University of Mainz > Johannes-von-Müller-Weg 6 > 55128 Mainz, Germany > phone: 0049-6131-3927848 > http://www.bio.uni-mainz.de/zoo/evobio/73_ENG_HTML.php > > Gemeinsam einen Unterschied machen! > www.synagieren.de > > 'For every complex problem there is an answer that is clear, simple, and > wrong.' (Henry Louis Mencken) > > > ------------------------------ > *Von:* Theodore Garland <theodore.garl...@ucr.edu> > *Gesendet:* Mittwoch, 30. November 2016 18:38 > *An:* Menzel, Dr. Florian > *Cc:* r-sig-phylo@r-project.org > *Betreff:* Re: [R-sig-phylo] phylogenetic signal different from BM and > random > > Dear Florian, > > What do you mean, exactly? Do you mean the K statistics is, say, about > 0.5, and that the randomizaton test for phylogenetic signal (Blomberg et > al. 2003), which is based on the MSE not K, is significant, indicating that > you do have some degree of signal (more than zero)? > > Cheers, > Ted > > Theodore Garland, Jr., Distinguished Professor > > Department of Biology > > University of California, Riverside > > Riverside, CA 92521 > > Office Phone: (951) 827-3524 > > Facsimile: (951) 827-4286 (not confidential) > > Email: tgarl...@ucr.edu > > http://www.biology.ucr.edu/people/faculty/Garland.html > > http://scholar.google.com/citations?hl=en&user=iSSbrhwAAAAJ > > > Director, UCR Institute for the Development of > <http://idea.ucr.edu/>Educational > Applications <http://idea.ucr.edu/> > > > Editor in Chief, *Physiological and Biochemical Zoology > <http://www.press.uchicago.edu/ucp/journals/journal/pbz.html>* > > > Fail Lab: Episode One > > http://testtube.com/faillab/zoochosis-episode-one-evolution > > http://www.youtube.com/watch?v=c0msBWyTzU0 > > > > On Wed, Nov 30, 2016 at 8:50 AM, Menzel, Dr. Florian <menz...@uni-mainz.de > > wrote: > >> Dear all, >> >> I am analysing phylogenetic signal using Blomberg's K. For several of my >> traits (univariate, continuous), the signal strongly deviates both from >> random and from the Brownian Motion. >> >> >> I am unsure how to interpret this. Can you give me some advice what this >> could mean? >> >> >> Thanks a lot! >> >> >> Florian >> >> >> Dr. Florian Menzel >> Department of Evolutionary Biology, Institute of Zoology >> University of Mainz >> Johannes-von-Müller-Weg 6 >> 55128 Mainz, Germany >> phone: 0049-6131-3927848 >> http://www.bio.uni-mainz.de/zoo/evobio/73_ENG_HTML.php >> >> Gemeinsam einen Unterschied machen! >> www.synagieren.de<http://www.synagieren.de> >> >> 'For every complex problem there is an answer that is clear, simple, and >> wrong.' (Henry Louis Mencken) >> >> [[alternative HTML version deleted]] >> >> >> _______________________________________________ >> R-sig-phylo mailing list - R-sig-phylo@r-project.org >> https://stat.ethz.ch/mailman/listinfo/r-sig-phylo >> Searchable archive at http://www.mail-archive.com/r- >> sig-ph...@r-project.org/ >> > > [[alternative HTML version deleted]] _______________________________________________ R-sig-phylo mailing list - R-sig-phylo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo Searchable archive at http://www.mail-archive.com/r-sig-phylo@r-project.org/
