1.xtreg cl bz cy gdp dc gg hf zz rg qt pri xy,fe
note: bz omitted because of collinearity
note: cy omitted because of collinearity
note: gdp omitted because of collinearity
note: dc omitted because of collinearity
note: gg omitted because of collinearity
note: hf omitted because of collinearity
note: zz omitted because of collinearity
note: rg omitted because of collinearity
note: qt omitted because of collinearity
note: pri omitted because of collinearity
note: xy omitted because of collinearity
Fixed-effects (within) regression Number of obs = 33
Group variable: id Number of groups = 33
R-sq: Obs per group:
within = . min = 1
between = . avg = 1.0
overall = . max = 1
F(0,0) = 0.00
corr(u_i, Xb) = . Prob > F = .
------------------------------------------------------------------------------
cl | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
bz | 0 (omitted)
cy | 0 (omitted)
gdp | 0 (omitted)
dc | 0 (omitted)
gg | 0 (omitted)
hf | 0 (omitted)
zz | 0 (omitted)
rg | 0 (omitted)
qt | 0 (omitted)
pri | 0 (omitted)
xy | 0 (omitted)
_cons | 882.3333 . . . . .
-------------+----------------------------------------------------------------
sigma_u | 327.06761
sigma_e | .
rho | . (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(32, 0) = . Prob > F = .
2. xtreg cl bz cy gdp dc gg hf zz rg qt pri xy,re
insufficient observations
r(2001);
求大神指导 这是什么问题啊 咋解决呀