Both papers provide explanations of comparative methods that I found very helpful. In Butler and King (p. 684) there is a discussion on how to improve a BM model by transforming the phylogeny. Apparently, the downside to this process is that transforming branch lengths will distort the phylogeny. Has anyone tried this approach? Specifically, how is the phylogeny distorted?
Also, I wonder how often the Hansen model is used and what the impact of non-clocklike phylogenetic behavior will have on the analysis. Because the Hansen model "requires phylogenetic branch lengths to be on a common timescale" (p. 686) how applicable is this model to the study of angiosperms (given phylogenies generally do not utilize mtDNA and are often non-clocklike)?
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