求解：下面的结果是什意思？
VAR Granger Causality/Block Exogeneity Wald Tests   
Date: 02/16/14   Time: 09:46   
Sample: 1 92   
Included observations: 90   
   
   
Dependent variable: RS   
   
Excluded Chi-sq df Prob.
   
GZD  15.84604 2  0.0004
   
All  15.84604 2  0.0004
   
   
Dependent variable: GZD   
   
Excluded Chi-sq df Prob.
   
RS  0.986200 2  0.6107
   
All  0.986200 2  0.6107