这是用ivregress做的之后的检验
. testparm faminc i(2/4).region
( 1) faminc = 0
( 2) 2.region = 0
( 3) 3.region = 0
( 4) 4.region = 0
F( 4, 44) = 13.30
Prob > F = 0.0000
这是ivreg2直接跑出来的
xi:ivreg2 rent pcturban (hsngval = faminc i.region)
i.region _Iregion_1-4 (naturally coded; _Iregion_1 omitted)
IV (2SLS) estimation
--------------------
Estimates efficient for homoskedasticity only
Statistics consistent for homoskedasticity only
Number of obs = 50
F( 2, 47) = 42.66
Prob > F = 0.0000
Total (centered) SS = 61243.12 Centered R2 = 0.5989
Total (uncentered) SS = 2816856 Uncentered R2 = 0.9913
Residual SS = 24565.71669 Root MSE = 22.17
------------------------------------------------------------------------------
rent | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
hsngval | .0022398 .0003284 6.82 0.000 .0015961 .0028836
pcturban | .081516 .2987652 0.27 0.785 -.504053 .667085
_cons | 120.7065 15.22839 7.93 0.000 90.85942 150.5536
------------------------------------------------------------------------------
Underidentification test (Anderson canon. corr. LM statistic): 27.364
Chi-sq(4) P-val = 0.0000
------------------------------------------------------------------------------
Weak identification test (Cragg-Donald Wald F statistic): 13.298
Stock-Yogo weak ID test critical values: 5% maximal IV relative bias 16.85
10% maximal IV relative bias 10.27
20% maximal IV relative bias 6.71
30% maximal IV relative bias 5.34
10% maximal IV size 24.58
15% maximal IV size 13.96
20% maximal IV size 10.26
25% maximal IV size 8.31
Source: Stock-Yogo (2005). Reproduced by permission.
------------------------------------------------------------------------------
Sargan statistic (overidentification test of all instruments): 11.288
Chi-sq(3) P-val = 0.0103
------------------------------------------------------------------------------
Instrumented: hsngval
Included instruments: pcturban
Excluded instruments: faminc _Iregion_2 _Iregion_3 _Iregion_4
------------------------------------------------------------------------------
ivreg2是只能显示Weak identification test (Cragg-Donald Wald F statistic): 13.298吗?显著性在哪显示呢?


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