st: SFA Results generated by Stata and Frontier4.1

[Benny Wong <anonymous>]

Hi, 
I fit a cost function frontier model (coelli 1992
model) using both Stata xfrontier and Frontier4.1, and
it turns out that the estimated inefficiency score and
coefficients (and of course the loglikehood  value) 
generated by these 2 softwares are different. The
difference vary between different model specifications
(ie which variables to put in). It is normal or should
I expect them to be them same?

Thanks
Ben





      
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