如下文所示,将EPS作为因变量,其余的是自变量,进行固定效应面板回归分析,所有的自变量都存在多重共线性问题,这是什么原因?样本数据没有不随时间变动的问题。
xtreg EPS Ts Cash Grow Tat Debt Con Lnsize i.year i.industry, fe robust
note: Ts omitted because of collinearity
note: Cash omitted because of collinearity
note: Grow omitted because of collinearity
note: Tat omitted because of collinearity
note: Debt omitted because of collinearity
note: Con omitted because of collinearity
note: Lnsize omitted because of collinearity
note: 2012.year omitted because of collinearity
note: 2013.year omitted because of collinearity
note: 2014.year omitted because of collinearity
note: 2015.year omitted because of collinearity
note: 2016.year omitted because of collinearity
note: 2017.year omitted because of collinearity
note: 2018.year omitted because of collinearity
note: 2019.year omitted because of collinearity
note: 2020.year omitted because of collinearity
note: 2.industry omitted because of collinearity
note: 3.industry omitted because of collinearity
note: 4.industry omitted because of collinearity
note: 5.industry omitted because of collinearity
note: 6.industry omitted because of collinearity
note: 7.industry omitted because of collinearity
note: 8.industry omitted because of collinearity
note: 9.industry omitted because of collinearity
note: 10.industry omitted because of collinearity
note: 11.industry omitted because of collinearity
note: 12.industry omitted because of collinearity
note: 13.industry omitted because of collinearity
note: 14.industry omitted because of collinearity
note: 15.industry omitted because of collinearity
note: 16.industry omitted because of collinearity
note: 17.industry omitted because of collinearity
note: 18.industry omitted because of collinearity
Fixed-effects (within) regression Number of obs = 28,121
Group variable: yearStkcd Number of groups = 28,121
R-sq: Obs per group:
within = . min = 1
between = . avg = 1.0
overall = . max = 1
F(0,28120) = .
corr(u_i, Xb) = . Prob > F = .
(Std. Err. adjusted for 28,121 clusters in yearStkcd)
------------------------------------------------------------------------------
| Robust
EPS | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
Ts | 0 (omitted)
Cash | 0 (omitted)
Grow | 0 (omitted)
Tat | 0 (omitted)
Debt | 0 (omitted)
Con | 0 (omitted)
Lnsize | 0 (omitted)
|
year |
2012 | 0 (omitted)
2013 | 0 (omitted)
2014 | 0 (omitted)
2015 | 0 (omitted)
2016 | 0 (omitted)
2017 | 0 (omitted)
2018 | 0 (omitted)
2019 | 0 (omitted)
2020 | 0 (omitted)
|
industry |
B | 0 (omitted)
C | 0 (omitted)
D | 0 (omitted)
E | 0 (omitted)
F | 0 (omitted)
G | 0 (omitted)
H | 0 (omitted)
I | 0 (omitted)
K | 0 (omitted)
L | 0 (omitted)
M | 0 (omitted)
N | 0 (omitted)
O | 0 (omitted)
P | 0 (omitted)
Q | 0 (omitted)
R | 0 (omitted)
S | 0 (omitted)
|
_cons | .4182011 . . . . .
-------------+----------------------------------------------------------------
sigma_u | .62331491
sigma_e | .
rho | . (fraction of variance due to u_i)
------------------------------------------------------------------------------
.


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