计量菜鸟一枚,哪位大神能帮忙看看下面的stata分析结果。本人研究公司股权结构和经营绩效之间的关系。其中被解释变量为EVA,解释变量为gyg(国有股比例),资产负债率=zcf,总资产的自然对数=size,第一大股东持股比例=dydgd,前十大股东持股比例=qsdgd, 第一大股东持股比例/第二至第十大股东持股比例=hed1。毕业硕士论文用,情况紧急,求各位大神帮帮忙!!!在此跪谢了!!!!
1/hed1=hed2
股权性质=cha
层级判断=lev
A股流通股比例=AGltg
xtset company year
panel variable: company (unbalanced)
time variable: year, 2007 to 2014, but with gaps
delta: 1 unit
. xtreg eva gyg agltg dydgd qsdgd hed1 zcf size,fe
Fixed-effects (within) regression Number of obs = 9471
Group variable: company Number of groups = 1566
R-sq: within = 0.0183 Obs per group: min = 1
between = 0.0006 avg = 6.0
overall = 0.0024 max = 8
F(7,7898) = 21.00
corr(u_i, Xb) = -0.4685 Prob > F = 0.0000
------------------------------------------------------------------------------
eva | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
gyg | .1093325 .0309347 3.53 0.000 .0486923 .1699727
agltg | .0774103 .0219665 3.52 0.000 .0343501 .1204705
dydgd | -.3153803 .0784377 -4.02 0.000 -.4691389 -.1616217
qsdgd | .5226604 .061039 8.56 0.000 .4030079 .6423129
hed1 | .0012767 .0008746 1.46 0.144 -.0004377 .0029911
zcf | .1105664 .0133541 8.28 0.000 .0843889 .1367439
size | .0126312 .0072696 1.74 0.082 -.0016192 .0268816
_cons | -.580565 .1558171 -3.73 0.000 -.8860078 -.2751223
-------------+----------------------------------------------------------------
sigma_u | .11533358
sigma_e | .27248197
rho | .15193718 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(1565, 7898) = 0.78 Prob > F = 1.0000
. estimates store FE
. xtreg eva gyg agltg dydgd qsdgd hed1 zcf size,re
Random-effects GLS regression Number of obs = 9471
Group variable: company Number of groups = 1566
R-sq: within = 0.0004 Obs per group: min = 1
between = 0.1101 avg = 6.0
overall = 0.0180 max = 8
Wald chi2(7) = 173.39
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000
------------------------------------------------------------------------------
eva | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
gyg | -.0002157 .0185752 -0.01 0.991 -.0366224 .036191
agltg | .0308567 .0132239 2.33 0.020 .0049384 .0567751
dydgd | -.0806811 .0307427 -2.62 0.009 -.1409358 -.0204264
qsdgd | .2019304 .0297227 6.79 0.000 .1436749 .2601859
hed1 | -.0006395 .0005636 -1.13 0.257 -.0017442 .0004652
zcf | -.0399734 .0072501 -5.51 0.000 -.0541833 -.0257635
size | .0180918 .0025506 7.09 0.000 .0130927 .0230909
_cons | -.4849346 .0531431 -9.13 0.000 -.589093 -.3807761
-------------+----------------------------------------------------------------
sigma_u | 0
sigma_e | .27248197
rho | 0 (fraction of variance due to u_i)
------------------------------------------------------------------------------
. estimates store RE
. hausman FE RE,constant sigmamore
Note: the rank of the differenced variance matrix (7) does not equal the number of
coefficients being tested (8); be sure this is what you expect, or there may
be problems computing the test. Examine the output of your estimators for
anything unexpected and possibly consider scaling your variables so that the
coefficients are on a similar scale.
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| FE RE Difference S.E.
-------------+----------------------------------------------------------------
gyg | .1093325 -.0002157 .1095482 .0240193
agltg | .0774103 .0308567 .0465535 .0170298
dydgd | -.3153803 -.0806811 -.2346992 .070586
qsdgd | .5226604 .2019304 .32073 .0520199
hed1 | .0012767 -.0006395 .0019162 .0006475
zcf | .1105664 -.0399734 .1505398 .01092
size | .0126312 .0180918 -.0054606 .006664
_cons | -.580565 -.4849346 -.0956305 .1434119
------------------------------------------------------------------------------
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(7) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 246.80
Prob>chi2 = 0.0000


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