看了网上的帖子,知道怎么做hausman检验(如下),但是结果我不知道该如何选择
xtreg ROE Rate LnSize Lev Owner1 Rel indeRate State,fe
note: State omitted because of collinearity
Fixed-effects (within) regression Number of obs = 1,451
Group variable: Stkcd_int Number of groups = 570
R-sq: Obs per group:
within = 0.0340 min = 1
between = 0.0234 avg = 2.5
overall = 0.0202 max = 9
F(6,875) = 5.14
corr(u_i, Xb) = -0.2482 Prob > F = 0.0000
------------------------------------------------------------------------------
ROE | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
Rate | 1.264523 .5174366 2.44 0.015 .2489611 2.280085
LnSize | .0057314 .0065719 0.87 0.383 -.0071671 .01863
Lev | -.094453 .0324405 -2.91 0.004 -.1581234 -.0307827
Owner1 | .2114925 .0600829 3.52 0.000 .0935691 .3294159
Rel | -.0092853 .0101952 -0.91 0.363 -.0292952 .0107246
indeRate | -.106998 .0863222 -1.24 0.215 -.2764209 .0624248
State | 0 (omitted)
_cons | -.0095531 .1516732 -0.06 0.950 -.3072389 .2881328
-------------+----------------------------------------------------------------
sigma_u | .07853109
sigma_e | .0664082
rho | .58306009 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(569, 875) = 2.72 Prob > F = 0.0000
. est store fe
. xtreg ROE Rate LnSize Lev Owner1 Rel indeRate State,re
Random-effects GLS regression Number of obs = 1,451
Group variable: Stkcd_int Number of groups = 570
R-sq: Obs per group:
within = 0.0154 min = 1
between = 0.0838 avg = 2.5
overall = 0.0795 max = 9
Wald chi2(7) = 72.94
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000
------------------------------------------------------------------------------
ROE | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
Rate | 1.391345 .4053853 3.43 0.001 .5968044 2.185885
LnSize | .0200519 .0030728 6.53 0.000 .0140294 .0260744
Lev | -.0977056 .0179754 -5.44 0.000 -.1329367 -.0624745
Owner1 | .0821221 .0212242 3.87 0.000 .0405234 .1237208
Rel | -.0011336 .0057371 -0.20 0.843 -.0123781 .0101108
indeRate | -.0620039 .0467672 -1.33 0.185 -.153666 .0296582
State | .0087122 .0105634 0.82 0.410 -.0119917 .0294161
_cons | -.3104223 .0669143 -4.64 0.000 -.4415719 -.1792728
-------------+----------------------------------------------------------------
sigma_u | .0562195
sigma_e | .0664082
rho | .41748321 (fraction of variance due to u_i)
------------------------------------------------------------------------------
. est store re
. hausman fe
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
Rate | 1.264523 1.391345 -.1268219 .3215641
LnSize | .0057314 .0200519 -.0143205 .0058093
Lev | -.094453 -.0977056 .0032526 .0270051
Owner1 | .2114925 .0821221 .1293704 .0562093
Rel | -.0092853 -.0011336 -.0081517 .0084278
indeRate | -.106998 -.0620039 -.0449941 .0725559
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xtreg
B = inconsistent under Ha, efficient under Ho; obtained from xtreg
Test: Ho: difference in coefficients not systematic
chi2(6) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 24.76
Prob>chi2 = 0.0004


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