stata做空间计量回归SEM模型出不来结果的原因是什么
用stata做空间计量回归时,做SEM模型结果是,固定效应可以出来结果,做随机效应时会出现以下提示,如下图,可以用什么方法解决?Iteration 0: Log-likelihood = -13315.62 Iteration 1: Log-likelihood = -13224.632
Iteration 2: Log-likelihood = -13221.844 (backed up)
Iteration 3: Log-likelihood = -13220.497 (backed up)
Iteration 4: Log-likelihood = -13220.166 (backed up)
Iteration 5: Log-likelihood = -13220.001 (backed up)
Iteration 6: Log-likelihood = -13219.99 (backed up)
Iteration 7: Log-likelihood = -13219.988 (backed up)
Iteration 8: Log-likelihood = -13219.987 (backed up)
numerical derivatives are approximate
nearby values are missing
Iteration 9: Log-likelihood = -13219.986 (backed up)
numerical derivatives are approximate
nearby values are missing
Iteration 10: Log-likelihood = -13219.986 (backed up)
numerical derivatives are approximate
nearby values are missing
Iteration 11: Log-likelihood = -13219.986 (backed up)
numerical derivatives are approximate
nearby values are missing
Hessian is not negative semidefinite
r(430);
做其他的都可以出来,就是做SEM随机效应的时候出不来结果,求大神帮忙啊
你好 我用xsmle做SEM 结果显示Specify ematrix() option with SEM model invalid syntax 请问是我的空间权重矩阵有问题吗 但我用同样的,做sar就出来结果 能否解答一下 谢谢
精彩解答:好像是这样的 用sar和sdm模型时, 是xsmle y x1 x2, wmat(w)。 但是sem模型时 命令应该改为xsmle y x1 x2, emat(w)或者是dmat(w) 具体是那个我忘了 你试一下嘛 反正就是 命令中空间权重举证那有变化
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