请问系统GMM检验中,扰动项的一阶差分不存在自相关说明什么?怎么解决?
Arellano-Bond test for zero autocorrelation in first-differenced errors
+-----------------------+
|Order | z Prob > z|
|------+----------------|
| 1 | -1.517 0.1293 |
| 2 | .16186 0.8714 |
+-----------------------+
H0: no autocorrelation


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