[其他] stata 里自己编写的最大似然函数结果总这样怎么回事？ [推广有奖]

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dyr1986 发表于 2010-4-24 12:42:48 |AI写论文

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Iteration 6: log likelihood = -3288.2861  (not concave)
numerical derivatives are approximate
nearby values are missing
numerical derivatives are approximate
nearby values are missing
Iteration 7: log likelihood = -3287.8147  (not concave)
Iteration 8: log likelihood = -3286.0873
numerical derivatives are approximate
nearby values are missing
Iteration 9: log likelihood = -3285.9439  (not concave)
numerical derivatives are approximate
nearby values are missing