[R-sig-phylo] apTreeshape and odd Colless scores

2012-09-03 Thread Simon Greenhill
Hi all, I've noticed that apTreeshape's _colless_ and _colless.test_ functions can give normalised/standardised Ic values outside the expected range of 0-1. For example, getcolless - function(tips) { # randomly generate a tree, and get the normalized Colless score.

Re: [R-sig-phylo] apTreeshape and odd Colless scores

2012-09-03 Thread Blum michael
Dear Simon, Normalization does not necessarily returns values between 0 and 1 but returns the values of the summary statistics divided by the standard deviation of the summary statistics that is expected under the Yule model. If you want to use that renormalization to compare tree shapes for