紧急求救：使用truncreg提示的错误！ [推广有奖]

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constant 发表于 2014-3-12 14:15:34 |AI写论文

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在用truncreg命令时，出现了如下的提示，不知如何解决，故请教高人！谢谢！

truncreg  exp income x ,ll(0)
(note: 4579 obs. truncated)
Fitting full model:
Iteration 0: log likelihood = -39284.388
Iteration 1: log likelihood = -37945.5
Iteration 2: log likelihood =  -36643.02
Iteration 3: log likelihood = -36434.545
Iteration 4: log likelihood = -36163.435
Iteration 5: log likelihood = -36052.784
Iteration 6: log likelihood = -36048.709
Iteration 7: log likelihood = -36047.034
Iteration 8: log likelihood = -36046.936  (backed up)
Iteration 9: log likelihood = -36046.929  (backed up)
Iteration 10:  log likelihood = -36046.926  (backed up)
Iteration 11:  log likelihood = -36046.925  (backed up)
numerical derivatives are approximate
nearby values are missing
numerical derivatives are approximate
nearby values are missing
cannot compute an improvement -- discontinuous region encountered
r(430);