xtreg lngdpp lnziben lnrenli,fe
Fixed-effects (within) regression Number of obs = 339
Group variable (i): diqu Number of groups = 31
R-sq: within = 0.8299 Obs per group: min = 9
between = 0.8888 avg = 10.9
overall = 0.8632 max = 11
F(2,306) = 746.31
corr(u_i, Xb) = -0.6694 Prob > F = 0.0000
------------------------------------------------------------------------------
lngdpp | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
lnziben | .8730654 .0338547 25.79 0.000 .8064478 .9396829
lnrenli | .9177117 .1054014 8.71 0.000 .7103084 1.125115
_cons | -1.101641 .2802304 -3.93 0.000 -1.653063 -.5502186
-------------+----------------------------------------------------------------
sigma_u | .25466526
sigma_e | .12663484
rho | .80175265 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(30, 306) = 22.85 Prob > F = 0.0000
.
. xtreg lngdpp lnziben lnrenli lnjiaoyi,fe
Fixed-effects (within) regression Number of obs = 327
Group variable (i): diqu Number of groups = 30
R-sq: within = 0.8415 Obs per group: min = 8
between = 0.8918 avg = 10.9
overall = 0.8641 max = 11
F(3,294) = 520.48
corr(u_i, Xb) = -0.7367 Prob > F = 0.0000
------------------------------------------------------------------------------
lngdpp | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
lnziben | .8362424 .0363819 22.99 0.000 .7646405 .9078443
lnrenli | 1.288762 .1289085 10.00 0.000 1.035062 1.542462
lnjiaoyi | .0964857 .0662568 1.46 0.146 -.0339121 .2268835
_cons | -1.632522 .3699249 -4.41 0.000 -2.360558 -.9044855
-------------+----------------------------------------------------------------
sigma_u | .28110029
sigma_e | .12243756
rho | .84053586 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(29, 294) = 24.44 Prob > F = 0.0000
.
jiaoyi这个变量不显著吗?R2减少了,是不是还不显著?