[R] specifying a model formula on the fly

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Subject: [R] specifying a model formula on the fly
From: Allan Strand (stranda@COFC.EDU)
Date: Wed 05 Jul 2000 - 03:10:40 EST 

Message-ID: <86wvj1254f.fsf_-_@linum.cofc.edu>

Hi All,

I'm trying to specify the formula for a glm based upon the names in
the data.frame. I always discard the first two variables in the frame
and the third will always be the only response variable. The problem
appears because I would like to specify the rest of the variables of
the data.frame as independent variables in the formula. I can't think
of a way to do this cleanly and maintain the names of the independent
variables in the glm object. I know that I can use as.matrix to cast
the rest of the data.frame as a design matrix, but the glm object
returned has "as.matrix(x)" prepended to the variable names. I
suspect that I could iterate across the results of name(x) and somehow
use quote() and eval() to solve this problem, but I cannot seem to
make it work. Any suggestions would be greatly appreciated.

Cheers,
a. 

-- 
Allan Strand,   Biology    http://linum.cofc.edu
College of Charleston      Ph. (843) 953-8085
Charleston, SC 29424       Fax (843) 953-5453

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