三 因果检验 首先输入命令show y x 在点击”View”-“Granger Causality”(取lag从5到1) Lags: 5 Null Hypothesis: Obs F-Statistic Probability X does not Granger Cause Y 51 0.82023 0.54261 Y does not Granger Cause X 1.35296 0.26244 Lags: 4 Null Hypothesis: Obs F-Statistic Probability X does not Granger Cause Y 52 0.41024 0.80026 Y does not Granger Cause X 1.34815 0.26777 Lags: 3 Null Hypothesis: Obs F-Statistic Probability X does not Granger Cause Y 53 0.42866 0.73342 Y does not Granger Cause X 2.88146 0.04590 Lags: 2 Null Hypothesis: Obs F-Statistic Probability X does not Granger Cause Y 54 1.31021 0.27905 Y does not Granger Cause X 4.87694 0.01171 Lags: 1 Null Hypothesis: Obs F-Statistic Probability X does not Granger Cause Y 55 1.36051 0.24877 Y does not Granger Cause X 4.70117 0.03474 拒绝x是y的原因犯错误的概论分别(lags从1到5)为:0.24877,0.27905,0.73342,0.80026,0.54261,平均起来有0.520822的概论还是很大的,所以不能拒绝x是y的解释原因。 拒绝y是x的原因犯错误的概论分别(lags从1到5)为:0.03474,0.01171,0.04590,0.26777,0.26244,平均一下只有0.124512,概论比较小。所以拒绝y是x的原因。 结论:x是y的解释原因,但y不是x的解释原因。这和实际也比较符合。

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