frontier y1 x1 x2 x3 ,
Stoc. frontier normal/half-normal model Number of obs = 140
Wald chi2(5) = 10962.17
Log likelihood = 105.56 Prob > chi2 = 0.0000
lngc Coef. Std. Err. z P>z [95% Conf. Interval]
lngd .0079489 .033514 0.24 0.813 -.0577374 .0736352
lnld 1.108171 .0329142 33.67 0.000 1.043661 1.172682
lnlt .9884015 .0299343 33.02 0.000 .9297313 1.047072
qw .0479743 .0178323 2.69 0.007 .0130237 .0829249
cb -.0415886 .0023635 -17.60 0.000 -.046221 -.0369562
_cons -8.959595 .3358664 -26.68 0.000 -9.617882 -8.301309
/lnsig2v -4.346918 .1337019 -32.51 0.000 -4.608969 -4.084867
/lnsig2u -10.18337 56.32194 -0.18 0.857 -120.5724 100.2056