运行完XTIVREG命令后,为什么直接输入xtoverid命令会出现无法识别?下面是操作过程:
xtivreg invest (mvalue=kstock time), re
G2SLS random-effects IV regression Number of obs = 200
Group variable: company Number of groups = 10
R-sq: within = 0.3707 Obs per group: min = 20
between = 0.8572 avg = 20.0
overall = 0.7343 max = 20
Wald chi2(1) = 80.40
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000
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invest | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
mvalue | .3270743 .0364773 8.97 0.000 .2555801 .3985686
_cons | -207.8319 45.17103 -4.60 0.000 -296.3655 -119.2983
-------------+----------------------------------------------------------------
sigma_u | 67.899792
sigma_e | 188.20021
rho | .11517403 (fraction of variance due to u_i)
------------------------------------------------------------------------------
Instrumented: mvalue
Instruments: kstock time
------------------------------------------------------------------------------
xtoverid
unrecognized command: xtoverid
r(199);