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英语翻译As usual,allresearchers directly calculate Granger causa

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英语翻译
As usual,all
researchers directly calculate Granger causality based on the
two estimated Model (1) and Model (2) for two given time
series and do not check re-estimation problem of realizations
of the estimated Model (2) at all.In the following,we
will show that the situation may change without above
assumptions.That is,without above assumptions,Granger
causality FX2!X1 = 0 does not necessarily mean a12;j \x11 0
and thus there exists real causality from X2 to X1.
怎么翻译
英语翻译As usual,allresearchers directly calculate Granger causa
通常,所有研究者根据两段给定时间的两个评价模型(1)和模型(2),直接计算Granger(农民?)伤亡,但是根本不核对估计模型(2)实现时的重新评价问题.下面,我们将证明,如果没有上述假设,那么情况可能会发生变化.即,没有上述假设时,Granger伤亡FX2!X1=0不一定是a12;j  0,从而从X2到X1有真实伤亡.
estimate暂时翻译为评价,也可译为估计,需要根据上下文予以确认.
casualty一般是指伤亡,也可指受害者,同样需要根据Granger 的意思予以确定.