用Eviews操作时，lag to include设置不同，出现结果不同，当为2和4的时候能统一，求问该选哪个？

当lag to include 设置为2时，出现结果

VAR Lag Order Selection Criteria      
Endogenous variables: LNEX LNK LNL LNA      
Exogenous variables: C      
Date: 03/14/13   Time: 10:21      
Sample: 1986 2011      
Included observations: 24      
      
Lag LogL LR FPE AIC SC HQ
      
0 -1.562842 NA   1.87e-05  0.463570  0.659912  0.515660
1  128.1381   205.3598*   1.47e-09*  -9.011507*  -8.029796*  -8.751059*
2  140.6361  15.62253  2.24e-09 -8.719676 -6.952595 -8.250869
      
* indicates lag order selected by the criterion      
LR: sequential modified LR test statistic (each test at 5% level)      
FPE: Final prediction error      
AIC: Akaike information criterion      
SC: Schwarz information criterion      
HQ: Hannan-Quinn information criterion      

当lag to include设置为4时，

VAR Lag Order Selection Criteria      
Endogenous variables: LNEX LNK LNL LNA      
Exogenous variables: C      
Date: 03/14/13   Time: 10:22      
Sample: 1986 2011      
Included observations: 22      
      
Lag LogL LR FPE AIC SC HQ
      
0  10.47081 NA   6.53e-06 -0.588255 -0.389884 -0.541525
1  122.4719  173.0926  1.09e-09 -9.315628 -8.323771 -9.081976
2  136.4324  16.49882  1.56e-09 -9.130222 -7.344880 -8.709649
3  163.0613  21.78723  9.81e-10 -10.09648 -7.517652 -9.488986
4  233.6301   32.07675*   2.60e-11*  -15.05728*  -11.68497*  -14.26287*
      
* indicates lag order selected by the criterion      
LR: sequential modified LR test statistic (each test at 5% level)      
FPE: Final prediction error      
AIC: Akaike information criterion      
SC: Schwarz information criterion