[R] specifying a model formula on the fly
Allan Strand
stranda at COFC.EDU
Tue Jul 4 19:10:40 CEST 2000
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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