xtabond2 y l(1/1).y l(0/1).(lnx1 lnx2 lnx3 lnx4 lnx5 lnx6),gmm(l.y lnx3 lnx4) iv(lnx1 lnx2 lnx5 lnx6 l.lnx3 l.lnx4)
Favoring space over speed. To switch, type or click on mata: mata set matafavor speed, perm.
Warning: Number of instruments may be large relative to number of observations.
Dynamic panel-data estimation, one-step system GMM
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Group variable: industry Number of obs = 540
Time variable : year Number of groups = 36
Number of instruments = 369 Obs per group: min = 15
Wald chi2(13) = 17665.20 avg = 15.00
Prob > chi2 = 0.000 max = 15
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y | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
y |
L1. | .9337127 .0101484 92.01 0.000 .9138222 .9536033
|
lnx1 |
--. | -.0276172 .229704 -0.12 0.904 -.4778287 .4225942
L1. | -.2208624 .2390644 -0.92 0.356 -.68942 .2476952
|
lnx2 |
--. | -.0516178 .0160474 -3.22 0.001 -.0830701 -.0201656
L1. | .0035064 .0160341 0.22 0.827 -.0279198 .0349326
|
lnx3 |
--. | .047741 .1066658 0.45 0.654 -.1613201 .2568021
L1. | .0674546 .1094267 0.62 0.538 -.1470178 .2819269
|
lnx4 |
--. | -.2687796 .1552037 -1.73 0.083 -.5729733 .035414
L1. | .0243729 .1549265 0.16 0.875 -.2792775 .3280233
|
lnx5 |
--. | -.1547076 .1493078 -1.04 0.300 -.4473455 .1379302
L1. | .2473335 .1498258 1.65 0.099 -.0463197 .5409866
|
lnx6 |
--. | -1.654132 .4532824 -3.65 0.000 -2.542549 -.7657146
L1. | 1.639324 .4575361 3.58 0.000 .7425694 2.536078
|
_cons | 2.633227 .7542815 3.49 0.000 1.154862 4.111591
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Instruments for first differences equation
Standard
D.(lnx1 lnx2 lnx5 lnx6 L.lnx3 L.lnx4)
GMM-type (missing=0, separate instruments for each period unless collapsed)
L(1/15).(L.y lnx3 lnx4)
Instruments for levels equation
Standard
lnx1 lnx2 lnx5 lnx6 L.lnx3 L.lnx4
_cons
GMM-type (missing=0, separate instruments for each period unless collapsed)
D.(L.y lnx3 lnx4)
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Arellano-Bond test for AR(1) in first differences: z = -9.54 Pr > z = 0.000
Arellano-Bond test for AR(2) in first differences: z = 0.87 Pr > z = 0.387
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Sargan test of overid. restrictions: chi2(355) = 397.99 Prob > chi2 = 0.057
(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(313) = 369.09 Prob > chi2 = 0.016
Difference (null H = exogenous): chi2(42) = 28.90 Prob > chi2 = 0.938
iv(lnx1 lnx2 lnx5 lnx6 L.lnx3 L.lnx4)
Sargan test excluding group: chi2(349) = 390.04 Prob > chi2 = 0.064
Difference (null H = exogenous): chi2(6) = 7.95 Prob > chi2 = 0.242
.