I don't think your specification is appropriate for a stochastic
frontier model. If you wish to control for firm specific effects use
-frontier- with firm dummy variables rather than first differencing.
Scott
On 7/12/07, vinish kathuria <[email protected]> wrote:
Thanks Scott!
If I don't suppress constant term, for few it
converges but for few it still shows - not concave.
However, the model also requires suppressing constant
term - as it is in difference!
Vinish
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