All- As far as I understand it, the vast majority of continuous character analyses assume that the trait is distributed normally and without bounds. Is there an appropriate transformation to for measurements of a trait that does have one or more bounds and where some taxa actually are at that bound? I have several traits where the bound is zero, and some taxa are actually at zero for this trait. (A practical example is 'spine length', where some taxa have virtually no spine.) And if there is no transformation applicable, is it analytically appropriate to remove taxa that have 'zero units' for that trait? Must we convert these traits to discrete categories to deal with them at all?
As always, I appreciate your advice. -Dave Bapst, UChicago -- David Bapst Dept of Geophysical Sciences University of Chicago 5734 S. Ellis Chicago, IL 60637 http://home.uchicago.edu/~dwbapst/ _______________________________________________ R-sig-phylo mailing list R-sig-phylo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo
