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st: predicting technical efficiency after frontier command:error message
I am running the following command.
reg lnrev lntoen lncap lntech lndebt
frontier lnrev lntoen lncap lntech lndebt, diff uhet(lnass dumfra-dumother,noconstant) vhet(lnass dumfra-dumother,noconstant) /*
*/from(lntoen=`a' lncap=`b' lntech=`c' lndebt=`d')
I am getting my parameter estimates and everything else fine, except for the predict command which gives the following error message.
" too many variables specified
I am basically modelling heteroscedasticity in both the one-sided and two-sided error component. In contrast, when I model heteroscedasticity in either one of them, then the predict command works fine. I have read the manual and it does not say anything about possible problems with predict, te when heteroscedasticity is modelled for both error components.
Any explanation why this is happening?
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