PX0706 发表于 2017-4-30 11:04
这个你看说明书
好的,我刚刚尝试着做了一下xtabond2的回归,回归命令如下:
xi:xtabond2 E l.E serviceshare lncap lnfdiin lnfdiout lngdpp i.A,gmm(l.E d.serviceshare d.lncap d.lngdpp,lag(1 2)) iv(serviceshare lncap lngdpp) small
结果如下:
Dynamic panel-data estimation, one-step system GMM
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> -
Group variable: R Number of obs = 2835
> 7
Time variable : A Number of groups = 203
> 4
Number of instruments = 151 Obs per group: min =
> 1
F(19, 28337) = 4069.20 avg = 13.9
> 4
Prob > F = 0.000 max = 1
> 4
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> -
E | Coef. Std. Err. t P>|t| [95% Conf. Interval
> ]
-------------+---------------------------------------------------------------
> -
E |
L1. | .9141246 .0044335 206.18 0.000 .9054347 .922814
> 6
|
serviceshare | .0023779 .0007905 3.01 0.003 .0008284 .003927
> 4
lncap | .0233874 .0017611 13.28 0.000 .0199355 .026839
> 3
lnfdiin | -.0054094 .0005647 -9.58 0.000 -.0065163 -.004302
> 6
lnfdiout | -.0018773 .0005507 -3.41 0.001 -.0029567 -.000797
> 9
lngdpp | .0008616 .0001982 4.35 0.000 .0004732 .001249
> 9
_IA_2001 | .0078857 .001098 7.18 0.000 .0057337 .010037
> 8
_IA_2002 | .0085812 .0010932 7.85 0.000 .0064385 .010723
> 9
_IA_2003 | .0116029 .0011058 10.49 0.000 .0094355 .013770
> 4
_IA_2004 | .004941 .0011065 4.47 0.000 .0027722 .007109
> 8
_IA_2005 | .0011809 .0011049 1.07 0.285 -.0009847 .003346
> 5
_IA_2006 | .0064189 .0011104 5.78 0.000 .0042424 .008595
> 3
_IA_2007 | .0043475 .0011049 3.93 0.000 .0021818 .006513
> 2
_IA_2008 | -.0035083 .0011079 -3.17 0.002 -.0056799 -.001336
> 8
_IA_2009 | .0040814 .0010833 3.77 0.000 .001958 .006204
> 7
_IA_2010 | -.0064321 .0010787 -5.96 0.000 -.0085464 -.004317
> 8
_IA_2011 | .0023802 .0010861 2.19 0.028 .0002513 .00450
> 9
_IA_2013 | .0000941 .0011031 0.09 0.932 -.0020681 .002256
> 2
_IA_2014 | .0057314 .0010816 5.30 0.000 .0036114 .007851
> 5
_cons | .073254 .0052565 13.94 0.000 .0629509 .083557
> 1
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> -
Instruments for first differences equation
Standard
D.(serviceshare lncap lngdpp)
GMM-type (missing=0, separate instruments for each period unless collapsed)
L(1/2).(L.E D.serviceshare D.lncap D.lngdpp)
Instruments for levels equation
Standard
serviceshare lncap lngdpp
_cons
GMM-type (missing=0, separate instruments for each period unless collapsed)
D.(L.E D.serviceshare D.lncap D.lngdpp)
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> -
Arellano-Bond test for AR(1) in first differences: z = -71.62 Pr > z = 0.00
> 0
Arellano-Bond test for AR(2) in first differences: z = 11.81 Pr > z = 0.00
> 0
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> -
Sargan test of overid. restrictions: chi2(131) =2087.28 Prob > chi2 = 0.00
> 0
(Not robust, but not weakened by many instruments.)
Difference-in-Sargan tests of exogeneity of instrument subsets:
GMM instruments for levels
Sargan test excluding group: chi2(79) = 336.19 Prob > chi2 = 0.00
> 0
Difference (null H = exogenous): chi2(52) =1751.09 Prob > chi2 = 0.00
> 0
iv(serviceshare lncap lngdpp)
Sargan test excluding group: chi2(128) =2072.53 Prob > chi2 = 0.00
> 0
Difference (null H = exogenous): chi2(3) = 14.75 Prob > chi2 = 0.00
> 2
能否帮忙解释下应该怎么解读这个回归结果,说明下这个回归结果里面出了什么问题,多谢?