On 2012-04-09 00:44, Hien Nguyen wrote:
Dear R-helpers,
I am trying to do a stepwise procedure in which I want to force some
variables in the model. I have searched around and it seems that only
leaps package allows to force the variable in the stepwise procedure. I
use the leaps package and use the regsubsets(lm1, force.in = 1, data) to
force 1 variable in the model. However, the force.in command only allow
me to force 1 variable in. I want to force several variables in the
procedure. How could I force them in?
Well, I don't know where you've searched, but the help page for
step() or for stepAIC() in pkg MASS tells you that there's a
scope= argument which should do what you want.
Peter Ehlers
Thanks a lot,
Hien
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