[R] Backward elimination in regression

From: <Denis.Aydin_at_unibas.ch>
Date: Tue, 22 Mar 2011 08:12:00 +0100

Dear all

I want to run a simple multiple linear regression model, say:

mod <- lm(y~x1+x2+x3+x4)

I have programmed a custom algorithm to calculate the p-values, because there is clustering present.

I ordered the variables according to their p-value and want to stepwise eliminate the variables with the highest p-values.

My question: How can I use "update" when I have only the variable name als string (e.g., "x1")? Or is there another convenient way to update the model?



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