stata 里自己编写的最大似然函数结果总这样怎么回事？

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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

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关键词：Stata 最大似然 似然函数 tata derivatives 结果 函数 Stata 编写