On 18.07.2012 18:03, Mati Bielawski wrote:> I would like to know how to use the keep parameter in the step function. Or
> the way to always keep one of my Xs, and the other Xs to be keep or not by
> step forward method.
See ?step and in particular the "lower" part of its scope argument:
step(...., scope = list(lower = ~ XtoKeep, upper = ~ X1 + X2 + etc))
Best,
Uwe Ligges
> Thank you all
> Mati Bielawski
>
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