Re: [R-sig-phylo] A question about phylogenetic signal significance with 1000 trees

2016-12-08 Thread Theodore Garland
And don't forget that measurement error in the tip data will also cause underestimation of phylogenetic signal, unless you use methods specifically designed to allow for that! Ives, A. R., P. E. Midford, and T. Garland. 2007. Within-species variation and measurement error in phylogenetic

Re: [R-sig-phylo] A question about phylogenetic signal significance with 1000 trees

2016-12-08 Thread David Bapst
A deep thought on this topic, from a mind run aground amidst grading papers. While I am a big fan of using multiple trees, we should keep in mind that phylogenetic uncertainty makes signal into a rather snaky concept. By this, I mean that there could have only been one true history (which may or

[R-sig-phylo] A question about phylogenetic signal significance with 1000 trees

2016-12-08 Thread Carturan, Bruno
Hello R-sig-phylo community, I am trying to measure the phylogenetic signal of functional traits with the Blomberg’s K and Pagel’s λ methods. My problem is that I don’t have one phylogenetic tree but 1000 (the trees were created by first combining different molecular, morphologic and