如题，还有我做多元回归时t 检验没有通过。不知道有哪位高人能帮我看看。以下是我的回归结果:

Dependent Variable: LNGDG   
Method: Least Squares   
Date: 05/30/10   Time: 22:48   
Sample: 1980 2006   
Included observations: 22   
   
Variable Coefficient Std. Error t-Statistic Prob.  
   
LNK 0.309270 0.308738 1.001726 0.3298
LNL 0.142675 0.312506 0.456551 0.6535
LNR 1.085812 0.461001 2.355338 0.0301
C 1.249113 2.247694 0.555731 0.5852
   
R-squared 0.244786     Mean dependent var  -3.128724
Adjusted R-squared 0.118917     S.D. dependent var  0.920510
S.E. of regression 0.864046     Akaike info criterion  2.708585
Sum squared resid 13.43836     Schwarz criterion  2.906956
Log likelihood -25.79443     F-statistic  1.944765
Durbin-Watson stat 1.509507     Prob(F-statistic)  0.158571
   
拟合度也不是很好。。。