[R-sig-phylo] correlation between discrete and continuous variables?

Liam J. Revell lrevell at nescent.org
Tue Dec 1 16:35:22 CET 2009

Hi Christoph, Stacey,

This might be a problem for which a logistic regression 
(http://en.wikipedia.org/wiki/Logistic_regression) would be 
appropriate.  If so, I encourage you to check out the following article, 
which I enjoyed:

Ives, A. R., and T. Garland Jr. 2009. Phylogenetic logistic regression 
for binary dependent variables. Systematic Biology (Advance Access). 
URL: http://sysbio.oxfordjournals.org/cgi/content/abstract/syp074v1.

Others on this list-serve might also be well suited to comment on this 
paper & method.

Sincerely, Liam

Liam J. Revell
NESCent, Duke University
web: http://anolis.oeb.harvard.edu/~liam/
NEW email: lrevell at nescent.org

sds21 at duke.edu wrote:
> Hi Christoph,
> There was some discussion following a similar question a year ago:
> The question:
> https://stat.ethz.ch/pipermail/r-sig-phylo/attachments/20080402/2e2b995e/attachment.pl 
> The threads:
> https://stat.ethz.ch/pipermail/r-sig-phylo/2008-April/thread.html#35
> I'll be interested to hear what approach you take, so let us (or me 
> anyway)
> know.
> Stacey
> Quoting Christoph Heibl <christoph.heibl at gmx.net>:
>> A question to the comparative method gurus:
>> I have a phylogeny for a group of plants that repeatedly evolved  
>> annuality from perennial ancestors. For each tip in the tree I have  
>> characterized the climatic tolerances (e.g. temperature,  
>> precipitation, ...)
>> .
>> I would like to assess if there is a significant correlation between  
>> life cycle (discrete) and climate variables (continuous).
>> I am not sure how to start with this and would appreciate your opinion!
>> Regards,
>> Christoph
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