. estat abond
cannot calculate AR tests with dropped variables
Arellano-Bond test for zero autocorrelation in first-differenced errors
cannot calculate test with dropped variables
+-----------------------+
|Order | z Prob > z|
|------+----------------|
| 1 | . . |
| 2 | . . |
| 3 | . . |
+-----------------------+
H0: no autocorrelation
请教各位,我在用stata做动态面板序列相关性检验时出现了这样的结果,不知道哪里出现了错误,它说cannot calculate AR tests with dropped variables,可是差分GMM,肯定会损失一些值呀,


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