Looking at the structure of the predict command under version 8, I think
the problem is that the version 9 predict routine does not properly
transform the output of _predict.
But I'm sure StataCorp will be on this quickly.
BTW, the problem affects svy: probit as well.
Best,
Nick Winter
At 01:05 PM 6/15/2005, you wrote:
At 10:42 AM 6/15/2005 -0400, Schonlau, Matthias wrote:
Dear stata listers:
In version 9, When I use predict after " svy: logit" the predicted
probabilities range from roughly 0.8 to greater than 2.0. I don't
understand this. When predicting in Version 8.0 (under version control) I
get predictions that are credible. The survey logistic regression give
the same coefficients for both version 8.0 and version 9.0 , the problem
is only the prediction.
My theory, incidentally, is that there is a bug in the built-in _predict
command. The reason this is my theory is because I can't see what it is
doing when I -set trace on-, and I don't see any other obvious
culprits. If it isn't that, then I bet there is a problem with logit_p.ado.
Incidentally one other workaround (I think) is to use mlogit or ologit
instead, e.g.
svy: mlogit y x
predict temp3 temp4
temp4 is the variable you want. This seems to work ok.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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