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inconvenient: logit when endog is (1,2) instead of (0,1) #1053
This breaks with a Singular Matrix problem in the Hessian calculation.
I think we should add a basic check for this.
I haven't looked at the details yet.
related: I was looking at using Logit for continuous variables in [0,1] interval, and it seemed to work.
We should raise an error if there are no zero values