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Stata中出现了这样的情况，请问是为什么呢？

11 |

0 | 2021-1-27 06:01:31 | 显示全部楼层 |阅读模式

xtregF1lnSub1lnRmw1lnPop1lnTrans1lnEdu1lnland1,fe
note:lnSub1omittedbecauseofcollinearity
note:lnRmw1omittedbecauseofcollinearity
note:lnPop1omittedbecauseofcollinearity
note:lnTrans1omittedbecauseofcollinearity
note:lnEdu1omittedbecauseofcollinearity
note:lnland1omittedbecauseofcollinearity
Fixed-effects(within)regression
Numberofobs=
295
Groupvariable:A
Numberofgroups =
295
R-sq:
Obspergroup:
within = .
min=
1
between= .
avg=
1.0
overall= .
max=
1
F(0,0)
= 0.00
corr(u_i,Xb) = .
Prob>F
=
.

F1 Coef. Std.Err. tP>t[95%Conf.Interval]
lnSub1
0 (omitted)
lnRmw1
0 (omitted)
lnPop1
0 (omitted)
lnTrans1
0 (omitted)
lnEdu1
0 (omitted)
lnland1
0 (omitted)
_cons-.03032
.
. .
.
.
sigma_u.7953651
sigma_e
.
rho
. (fractionofvarianceduetou_i)
Ftestthatallu_i=0:F(294,0)=.
Prob>F= .
分 -->

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