From: Frank E Harrell Jr walmir-rodrigues wrote:
Dear Fellows, How can I do to proced a step wise regression in R, if it??s
possible ?
Thanks, Walmir
Here is an easy approach that will yield results only slightly less valid than one actually using the response variable: x <- data.frame(x1,x2,x3,x4,..., other potential predictors) x[,sample(ncol(x))]
Hmm... Shouldn't that be something like: x[, sample(ncol(x), ceiling(ncol(x) * runif(1)))] ? Cheers, Andy
:-) -Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics
Vanderbilt University
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