st: Computing marginal effects

["Lok Wong" <lokwong80@hotmail.com>]

Hi there,

After I estimated a multinomial logit model, I wanted to calculate the 
marginal effects..and I used
- mfx -....However, it took forever to do that...After I stopped it, STATA 
said that "fail in calculating second derivative, no standard deviation 
reported"...Why this happened? How to solve it?

Thanks a lot for your kind help..

Lok

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