Oscar Inostraza --
Is the variable x also evolving on the tree? If so you need to use
standard phylogenetically-informed comparative methods to estimate the
variances and covariances of changes in both characters.
You may not be able to assume that y responds instantly to x.
J.F.
----
Joe Felsenstein, j...@gs.washington.edu
Department of Genome Sciences, University of Washington, Box 355065,
Seattle, WA. 98195-5065 USA
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