SFA 随机前沿生产函数结果好像运行出来不是很好，求点评~ - Stata专版

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傻小花 发表于 2014-7-6 17:50:15 |AI写论文

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就是这个结果，感觉不太好，有哪位能帮忙看一下么？谢谢~Iteration 21:  log likelihood =  49.720845  Iteration 22:  log likelihood =  49.720864
Iteration 23:  log likelihood =  49.720878
Iteration 24:  log likelihood =  49.720889
Iteration 25:  log likelihood =  49.720891

Stoc. frontier normal/half-normal model          Number of obs =       22
                                                Wald chi2(2) = 5.96e+11
Log likelihood =  49.720891                      Prob > chi2    =    0.0000

------------------------------------------------------------------------------
      lny |    Coef. Std. Err.    z P>|z|    [95% Conf. Interval]
-------------+----------------------------------------------------------------
      lnk | .7844678 1.03e-06  7.6e+05 0.000    .7844658 .7844698
      lnl |  -.0431607 7.57e-06 -5704.75 0.000 -.0431755 -.0431459
   _cons | .6806129 .0000326  2.1e+04 0.000    .680549 .6806767
-------------+----------------------------------------------------------------
/lnsig2v | -38.0677 382.5698 -0.10 0.921 -787.8907 711.7553
/lnsig2u |  -5.971664 .3015114 -19.81 0.000 -6.562615 -5.380712
-------------+----------------------------------------------------------------
   sigma_v | 5.42e-09 1.04e-06                   8.2e-172 3.6e+154
   sigma_u | .0504975 .0076128                   .0375791 .0678568
   sigma2 |    .00255 .0007689                   .0010431 .0040569
   lambda | 9323234 .0076128                      9323234    9323234
------------------------------------------------------------------------------
Likelihood-ratio test of sigma_u=0: chibar2(01) = 8.93 Prob>=chibar2 = 0.001

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