Iteration 0: log likelihood = -12.370564 (not concave)
Iteration 1: log likelihood = -12.269822 (not concave)
Iteration 2: log likelihood = 9.2388246 (not concave)
Iteration 3: log likelihood = 17.193743
Iteration 4: log likelihood = 18.170514
Iteration 5: log likelihood = 18.196793
Iteration 6: log likelihood = 18.196913
Iteration 7: log likelihood = 18.196913
Stoc. frontier normal/half-normal model Number of obs = 126
Wald chi2(4) = 9.21
Log likelihood = 18.196913 Prob > chi2 = 0.0561
------------------------------------------------------------------------------
lgyield | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
lgalllabor | .0093377 .0133965 0.70 0.486 -.0169191 .0355944
lgcmfertamt | .0538468 .0191994 2.80 0.005 .0162166 .0914769
hbrseed | .0043626 .0291772 0.15 0.881 -.0528236 .0615489
tractor | -.0096552 .0267001 -0.36 0.718 -.0619864 .0426759
_cons | 1.848183 .1323797 13.96 0.000 1.588724 2.107642
-------------+----------------------------------------------------------------
/lnsig2v | -7.894283 1.548274 -5.10 0.000 -10.92885 -4.859721
/lnsig2u | -1.806592 .139734 -12.93 0.000 -2.080466 -1.532719
-------------+----------------------------------------------------------------
sigma_v | .0193098 .0149485 .0042348 .0880491
sigma_u | .4052318 .0283123 .3533724 .4647018
sigma2 | .1645857 .0227563 .1199842 .2091871
lambda | 20.98579 .0362339 20.91477 21.0568
------------------------------------------------------------------------------
Likelihood-ratio test of sigma_u=0: chibar2(01) = 61.44 Prob>=chibar2 = 0.000
.
end of do-file