st: dtobit

["21443017" <wzhan01@qub.ac.uk>]

Dear All,

I have a problem of using dtobit. I am trying to estimate the marginal
effects after a tobit model by using dtobit. However, stata reports "[_se]
not found". What would be the problem?

The code I used is 

 tobit y x1 x2 x3 ll(0)
dtobit


Thanks for your help

Best
Wen


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