Nick, many thanks for your help.
I have read the FAQ file on Stata Site. I share their (Harrel & Conroy)
view on this point, but I have to set a interpretation model of a dipendent
variable and I have more than 500 indipendent variables. I have select the
more correlate variables but I need a procedure to select the most explanatory
variables.
If I don't apply the sw linear regression I don't know how select the indipendent
variables. I have to do.
But the procedure in Stata doesn't correspond to the model I studied in
many manuals. In particular, the sw procedure should go forward and back
but in Stata I don't see the different between the sw and the forward or
backward simple selections.
If I don't use the sw procedure, how select the variables??
Many many thanks.
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