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To run logistic regression (with a binary dependent variable Y) define a
constant variable, say I, (with all values =1) with mask `N' and
activate
GENREG <data>,L / ERROR=Binomial .
To have a constant term included, define another constant variable,
say C=1 with mask `X' as other independent variables.

The most convenient way of applying GENREG in logistic regression is
provided by the /LOGREG sucro (made by Kimmo Vehkalahti).

   G = More information on GENREG 
   L = /LOGREG