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st: Translog Cost and Production Frontier Estimation

From   Assa Maganga <>
Subject   st: Translog Cost and Production Frontier Estimation
Date   Wed, 5 Oct 2011 18:13:23 +0200

Dear Statalists,

I am running translog cost and production frontiers. I am constrained
on how to impose symmetry restrictions on coeffients of interacting
variables (bij=bji)? For interacting XiXj, do you generarate a new
variable or enter them independently into the model like (Xi*Xj)?
However, the later is giving an error (time series operator are not
allowed). Anybody who know how to do this please?

STATA is fun
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