Stella, 
  An obvious answer is 
   ?step
  However, I'm having a bit of a problem with it, lately.  I got it wording with backwards selection, then it didn't work when I changed the "direction" from "backward" to "both" (backwards and forwards).  I would like to know whatever you find that works.  Also, look at the procedures for logistic regression in the Design package.  
   
  regards,
  Farrar

Sergio Della Franca <sergio.della.franca@gmail.com> wrote:
  Dear R-Helpers,

I'd like to perform a Logistic Regression whit a Stepwise method.


Can you tell me how can i proceed to develop this procedure?


Thank you in advance.


Sergio Della Franca.

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