. webuse abdata
. xtdpd l(0/2).n l(0/1).(w ys) k, dgmmiv(n) div(l(0/1).(w ys) k)
Dynamic panel-data estimation Number of obs = 751
Group variable: id Number of groups = 140
Time variable: year
Obs per group: min = 5
avg = 5.364286
max = 7
Number of instruments = 33 Wald chi2(7) = 1434.37
Prob > chi2 = 0.0000
One-step results
------------------------------------------------------------------------------
n | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
n |
L1. | .5779025 .1351405 4.28 0.000 .3130319 .8427731
L2. | -.0920163 .0462129 -1.99 0.046 -.1825919 -.0014407
|
w |
--. | -.6100184 .0605643 -10.07 0.000 -.7287223 -.4913146
L1. | .2930618 .101849 2.88 0.004 .0934413 .4926822
|
ys |
--. | .6849995 .0839359 8.16 0.000 .5204882 .8495108
L1. | -.4868203 .1503792 -3.24 0.001 -.7815581 -.1920824
|
k | .3623754 .0355449 10.19 0.000 .2927087 .432042
_cons | .7667895 .4707679 1.63 0.103 -.1558987 1.689478
------------------------------------------------------------------------------
Instruments for differenced equation
GMM-type: L(2/.).n
Standard: D.w LD.w D.ys LD.ys D.k
Instruments for level equation
Standard: _cons
estat sargan
Sargan test of overidentifying restrictions
H0: overidentifying restrictions are valid
chi2(25) = 71.97396
Prob > chi2 = 0.0000
我这个没问题,软件原因?


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