Having 0s and 1s is not absolutely a barrier
to using logit links, so as you use -glm-.
There is some discussion of this in the
StataCorp FAQ referenced by others.
Nick
[email protected]
David Greenberg
>
> You should not use probit (or logit). Treat your dependent
> variable as continuous, ranging between 0 and 1. To linearize
> the equation, create a new variable, ln[PIT/(1-PIT)] and
> treat that as a dependent variable. This will work as long as
> you don't have values in which PIT is 0 or 1. If you do, you
> may need to use a different transformation.
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