Programming the statistical procedures from SAS

Frontier with QLIM (vs STATA)

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Frontier with QLIM (vs STATA)

I am running a half-normal production frontier analysis with proc QLIM.
I would like to be able to get the technical efficiencies to match up to STATA using
frontier. I have been unable to get the same results from both packages.

qlim data=work_dataset1  METHOD=NEWRAP covest=hessian;

model lnAAA = lnBBB lnCCC lnDDD;

endogenous lnAAA ~ frontier (type=HALF production);

output out = work_out1 TE1 TE2 EXPECTED;

The documentation for the technical efficicneies in SAS are

TE1

outputs estimates of
technical efficiency for each producer in the stochastic frontier model
suggested by Battese and Coelli (1988).

TE2

outputs estimates of
technical efficiency for each producer in the stochastic frontier model
suggested by Jondrow et al. (1982).

STAT documents

produces estimates of the technical efficiency via TE = E(exp(-u|e)]

This has been documented as derrived from (by Battese and Coelli (1988) too?

and can also produce

produces estimates of minus the natural log of the technical efficiency via TE = exp(-E(u|e)]

produces estimates of minus the natural log of the technical efficiency via TE = exp(-M(u|e)]

Has anyone been able to get the same resutls from QLIM and frontier? Any suggestions?

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