In the course of my research, I develop new methods for studying macroevolution. Most of these are implemented in the R programming language. Major methods will be implemented in a forthcoming release of the popular GEIGER package, maintained by Luke Harmon. I’m going to post some additional useful code and functions here.
This download is a folder containing a modified version of geiger’s disparity through time code (see Harmon et al. 2003, Science) that produces a DTT plot with pretty, shaded 95% confidence intervals. The code will also return a p-value for the morphological disparity index (MDI). This approach was described in our paper on Cetacean body size evolution (Slater et al. 2010 Proc Roy Soc). The data from that paper, plus an example script are also provided. NOTE: The original version of this function posted on my old UCLA website is not compatible with geiger versions 1.99 and above. This version is compatible with 1.99 onwards but has not been tested with older versions.