求高手帮忙分析下SYS—GMM结果，万分感谢！
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          CR |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
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          CR |
         L1. |      .8963   .0318438    28.15   0.000     .8312664    .9613337
             |
         IFE |   .6067171   .1416337     4.28   0.000     .3174624    .8959717
          GR |   -.417392   .0560123    -7.45   0.000    -.5317844   -.3029995
         LNE |   .3661516   .3935838     0.93   0.360    -.4376538    1.169957
          FD |   .1314029    .051638     2.54   0.016     .0259441    .2368618
         SOE |   .1103946   .0531273     2.08   0.046     .0018942    .2188951
         EDU |   -1.21065    .313399    -3.86   0.001    -1.850696   -.5706036
          EA |   .0201639   .0082008     2.46   0.020     .0034157    .0369122
       _cons |  -.2895815   .2632118    -1.10   0.280    -.8271317    .2479688
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Warning: Uncorrected two-step standard errors are unreliable.

Instruments for first differences equation
  Standard
    D.(LNE SOE EDU EA)
  GMM-type (missing=0, separate instruments for each period unless collapsed)
    L(1/.).(L.CR L.IFE L.GR L.FD)
Instruments for levels equation
  Standard
    _cons
    LNE SOE EDU EA
  GMM-type (missing=0, separate instruments for each period unless collapsed)
    D.(L.CR L.IFE L.GR L.FD)
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Arellano-Bond test for AR(1) in first differences: z =  -2.32  Pr > z =  0.021
Arellano-Bond test for AR(2) in first differences: z =   0.85  Pr > z =  0.393
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Sargan test of overid. restrictions: chi2(170)  = 243.86  Prob > chi2 =  0.000
  (Not robust, but not weakened by many instruments.)
Hansen test of overid. restrictions: chi2(170)  =  30.37  Prob > chi2 =  1.000
  (Robust, but can be weakened by many instruments.)

Difference-in-Hansen tests of exogeneity of instrument subsets:
  GMM instruments for levels
    Hansen test excluding group:     chi2(138)  =  30.37  Prob > chi2 =  1.000
    Difference (null H = exogenous): chi2(32)   =   0.00  Prob > chi2 =  1.000
  iv(LNE SOE EDU EA)
    Hansen test excluding group:     chi2(166)  =  29.72  Prob > chi2 =  1.000
    Difference (null H = exogenous): chi2(4)    =   0.65  Prob > chi2 =  0.957