SFTFE command error

[Johanes Gambe]

Hi,
I am trying to run the command "SFTFE" for the stochastic frontier function with heteroscedastic. When I execute the command "sftfe ln_y ln_x, est(pde) dist(exp) emean(z) usigma(z)", this error message appear

variance(): 3301 subscript invalid
_sftfe_Get_SoL_and_PoSt_ReS(): - function returned error
_sftfe_sf_est_ml(): - function returned error
<istmt>: - function returned error
How can I fix this problem? Any help is highly appreciated

Best regards,
Jo

[William Lisowski]

The error message is uninformative to anyone other than the authors of the community contributed sftfe command. It tells the authors of a problem with their code, but makes no sense to the user.

With that said, I note that your command is

sftfe ln_y ln_x, est(pde) dist(exp) emean(z) usigma(z)

But the output of help sftfe tells us that for est(pde) the emean() option is only used with the dist(tnormal) option. Perhaps that caused a problem that sftfe overlooked.

[Johanes Gambe]

Hi William, Thank you so much for your suggestion, and I really appreciate it. Today I have found the solution. The problem is that I use Stata 17. When I use Stata 15 it works.