[R] Forward Stepwise regression with stepAIC and step
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu May 8 11:34:50 CEST 2003
On Thu, 8 May 2003 pfm401 at lineone.net wrote:
> I cannot seem to get the R functions step or stepAIC to perform forward
> or stepwise regression as I expect.
> In other words no forward procedure has been run (similar results apply
> if I use direction="step")!!
That's not a valid value for `direction': see the help page.
> What am I doing wrong?? Thanks in advance for any help.
You not given a `scope' argument, so there are no variables to add.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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