st: forcing variables into a stepwise logistic regression

["Cram, Peter" <peter-cram@uiowa.edu>]

Dear Statalist,

using the command:

sw logistic mort30 var1 var2 varX, i can perform stepwise logistic
regression.

i can insure that var1 is included in my final model by doing:  
sw logistic mort30 var1 var2 varX, lockterm1


but if i want to force both var1 and var2 into my model, the sw command does
not seem to allow this (e.g.
sw logistic mort30 var1 var2 varX, lockterm1 lockterm2

gives an error message.


how can i force both var1 and var2 into my model and still do a stepwise
regression.

thanks,

pete
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