arlionn 发表于 2011-12-1 16:16
你把完整的命令列出来。
同时,请输入 xtdes 命令,把结果也贴出来。
xtdpdsys wage1 own ys1 mkup tax tr_pro size dq indus2, lags(1) twostep endog( cap,lag(1,2) ) endog(out,lag(1,3))artests(2)
System dynamic panel-data estimation Number of obs = 532173
Group variable: num Number of groups = 267886
Time variable: year
Obs per group: min = 1
avg = 1.986565
max = 4
Number of instruments = 17 Wald chi2(13) = 1913.75
Prob > chi2 = 0.0000
Two-step results
------------------------------------------------------------------------------
wage1 | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
wage1 |
L1. | .5947422 .0416395 14.28 0.000 .5131304 .676354
|
cap |
--. | .1355102 .0987312 1.37 0.170 -.0579993 .3290198
L1. | .2762133 .0773079 3.57 0.000 .1246925 .4277341
|
out |
--. | .0009883 .0004919 2.01 0.045 .0000241 .0019524
L1. | -.0008774 .0004856 -1.81 0.071 -.001829 .0000743
|
own | .0005978 .0012275 0.49 0.626 -.001808 .0030036
ys1 | .1731251 .0324977 5.33 0.000 .1094307 .2368195
mkup | -.3765018 .0290065 -12.98 0.000 -.4333535 -.3196501
tax | -.0003548 .0005462 -0.65 0.516 -.0014253 .0007157
tr_pro | -.0444372 .006025 -7.38 0.000 -.056246 -.0326284
size | -.0771895 .016611 -4.65 0.000 -.1097464 -.0446326
dq | -.0331507 .0169373 -1.96 0.050 -.0663473 .0000458
indus2 | -.0020759 .0009514 -2.18 0.029 -.0039407 -.0002111
_cons | .3035363 .3101361 0.98 0.328 -.3043194 .9113919
------------------------------------------------------------------------------
Warning: gmm two-step standard errors are biased; robust standard
errors are recommended.
Instruments for differenced equation
GMM-type: L(2/.).wage1 L(2/3).L.cap L(2/4).L.out
Standard: D.own D.ys1 D.mkup D.tax D.tr_pro D.size D.dq D.indus2
Instruments for level equation
GMM-type: LD.wage1 L2D.cap L2D.out
Standard: _cons
. estat abond
Arellano-Bond test for zero autocorrelation in first-differenced errors
+-----------------------+
|Order | z Prob > z|
|------+----------------|
| 1 | . . |
| 2 | . . |
+-----------------------+
H0: no autocorrelation
. estat sargan
Sargan test of overidentifying restrictions
H0: overidentifying restrictions are valid
chi2(3) = 2.174183
Prob > chi2 = 0.5371