[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.


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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