I was wondering if anybody could offer some guidance on two problems I have
dealing with xtfrontier.
Using panel data, I am trying to estimate technical efficiency for a group
of firms, over 10 years. The main problem I encounter is that, when I
predict the technical efficiency scores, I get a single value for each firm,
instead of one value per firm per year. My understanding is that if I use
the time varying efficiency option (tvd), these values should be different
within firms from year to year. This is an example of the code I use.
Alternatively, I have also tried to include time dummies to account for
technical progress. Same situation.
I would appreciate any guidance on this matter. Also, once I reach the
technical scores, I would like to make them dependent on a set of firm
attributes (not the ones I have used in the stochastic production frontier).
Is this supposed to be a separate analysis that cannot be estimated through
xtfrontier?.
