题目内容：

请问格兰杰因果关系如何检验,谢谢.
Null Hypothesis: Obs F-Statistic Probability

LNW does not Granger Cause LNCONS 9 1.92071 0.26021
LNCONS does not Granger Cause LNW 0.46121 0.66033

LNY does not Granger Cause LNCONS 9 4.68918 0.08940
LNCONS does not Granger Cause LNY 0.45422 0.66410

LNY does not Granger Cause LNW 9 0.07064 0.93293
LNW does not Granger Cause LNY 4.93222 0.08324

还有obs只有9个,是不是不能进行格兰杰因果检验,谢谢各位朋友.