st: Problem to estimate stochastic frontier model with sfcross

[Söllner, René <rene.soellner@destatis.de>]

Dear Statalist users,

I'm trying to estimate a stochastic frontier model for cross-sectional data
using the the -sfcross- command described in Belotti el al. (2012).
Unfortunately the following error message occurs:

                <istmt>:  3499  _starting_values_cs() not found
r(3499);

Does someone know what the error means and how I can fix it?

By the way, the same error occurs if I try to run an example provided in the
sfcross help:  

        . webuse frontier1
        . sfcross lnoutput lnlabor lncapital

                 <istmt>:  3499  _starting_values_cs() not found
r(3499);

Many thanks,
René



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