[R-sig-phylo] PGLS vs OUwie?
Hi all, This may be a very basic question, but I have been racking my brain since my advisor asked me yesterday in our meeting. What are the fundamental differences (if any) between GLS (PGLS) and something like ouch or OUwie? If there is already literature related to this, please feel free to just point me in that direction. Thanks in advance, Will -- William Gearty PhD Student, Paleobiology Department of Geological Sciences Stanford School of Earth, Energy Environmental Sciences people.stanford.edu/wgearty [[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/
Re: [R-sig-phylo] PGLS vs OUwie?
Dear Will, I suggest that you read the Appendix in this paper Lavin et al. (2008) (available on my website) and then the original papers by Butler and King on OUCH, etc. http://www.jstor.org/stable/10.1086/590395 Cheers, Ted Theodore Garland, Jr., 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=enuser=iSSbrhwJ Director, UCR Institute for the Development of Educational Applications Editor in Chief, Physiological and Biochemical Zoology Fail Lab: Episode One http://testtube.com/faillab/zoochosis-episode-one-evolution http://www.youtube.com/watch?v=c0msBWyTzU0 From: R-sig-phylo [r-sig-phylo-boun...@r-project.org] on behalf of William Gearty [wgea...@stanford.edu] Sent: Tuesday, May 05, 2015 8:39 AM To: r-sig-phylo Subject: [R-sig-phylo] PGLS vs OUwie? Hi all, This may be a very basic question, but I have been racking my brain since my advisor asked me yesterday in our meeting. What are the fundamental differences (if any) between GLS (PGLS) and something like ouch or OUwie? If there is already literature related to this, please feel free to just point me in that direction. Thanks in advance, Will -- William Gearty PhD Student, Paleobiology Department of Geological Sciences Stanford School of Earth, Energy Environmental Sciences people.stanford.edu/wgearty [[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/ ___ 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/
Re: [R-sig-phylo] PGLS vs OUwie?
Hi William, �ouch� and �OUwie� are based on Generalized Least Squares (GLS). Indeed, �generalized� mean that we can fit a linear model with between species hierarchical structure ( given e.g. by interspecies evolutionary variances-covariances according to an Ornstein-Uhlenbeck process) Nevertheless, it�s true that in most papers you will often find the term (P)GLS when a linear model with one response variable and one predictor variable is fitted. Methods such as �ouch� and �OUwie� fit a model without intercept (or predictor variable) but there is no differences in the statistical machinery behind� Best, Julien From: wgea...@stanford.edu Date: Tue, 5 May 2015 08:39:17 -0700 To: R-sig-phylo@r-project.org Subject: [R-sig-phylo] PGLS vs OUwie? Hi all, This may be a very basic question, but I have been racking my brain since my advisor asked me yesterday in our meeting. What are the fundamental differences (if any) between GLS (PGLS) and something like ouch or OUwie? If there is already literature related to this, please feel free to just point me in that direction. Thanks in advance, Will -- William Gearty PhD Student, Paleobiology Department of Geological Sciences Stanford School of Earth, Energy Environmental Sciences people.stanford.edu/wgearty [[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/ [[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/
