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lm with an arbitrary number of terms

Richard Nixon 
Hello folks,

Any ideas how to do this?

data.frame is a data frame with column names "x1",...,"xn"
y is a response variable of length dim(data.frame)[1]

I want to write a function

function(y, data.frame){
    lm(y~x1+...+xn)
}

This would be easy if n was always the same.
If n is arbitrary how could I feed the x1+...+xn terms into lm(response~terms)?

Thanks
Richard

--
Dr. Richard Nixon
MRC Biostatistics Unit, Cambridge, UK
http://www.mrc-bsu.cam.ac.uk/personal/richard
Tel: +44 (0)1223 330382, Fax: +44 (0)1223 33038

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