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Re: st: Marginal effect after -clogit- and -xtlogit-


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Marginal effect after -clogit- and -xtlogit-
Date   Fri, 6 Feb 2009 16:56:22 -0500

Maarten is correct: -predict(pu0)- gives the predicted probability when the intercept is zero. However, zero may not be a plausible value. For example: consider an unconditional model Y= logit(P) = a + ln(2)X, corresponding to OR = 2.0, for a one-unit increase in X. If the likely range of probabilities is 0.01 to 0.30, the corresponding range of Y is about -4.60 to -0.85. If X > -1, then a = 0 is not possible.

-Steve
On Feb 6, 2009, at 3:01 PM, Maarten buis wrote:


--- On Fri, 6/2/09, Supnithadnaporn, Anupit wrote:
I analyze the data using both -clogit- and -xtlogit fe-
commands. I would like to get the marginal effect of each
independent variables in the model. However, -mfx- command
does not work after both -clogit- and -xtlogit fe-, giving
the error

predict() expression  unsuitable for marginal effect
calculation
r(119);

Would anyone please suggest me how to get the marginal
effect after running -clogit- and -xtlogit fe-?

-mfx, predict(pu0)-


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