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下述结果是用面板数据做出的结果，是否可用？如不可用需如何改进？

谢谢

xtreg v12 log v7 v10 sizeage, fe

Fixed-effects (within) regression Number of obs = 250
Group variable (i): stkcd Number of groups = 50

R-sq: within = 0.1516 Obs per group: min = 5
between = 0.2099 avg = 5.0
overall = 0.1268 max = 5

F(3,197) = 11.74
corr(u_i, Xb) = -0.7248 Prob > F = 0.0000

------------------------------------------------------------------------------
v12 | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
log | 658.4801 289.9299 2.27 0.024 86.71535 1230.245
v7 | 141.7374 33.28625 4.26 0.000 76.09428 207.3805
v10 | (dropped)
sizeage | -82.85968 32.44082 -2.55 0.011 -146.8355 -18.88383
_cons | -1200.356 295.1242 -4.07 0.000 -1782.365 -618.348
-------------+----------------------------------------------------------------
sigma_u | 19.655635
sigma_e | 20.578124
rho | .47708382 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(49, 197) = 1.74 Prob > F = 0.0043

xtgls v12 log v7 v10,panel(he)

Cross-sectional time-series FGLS regression

Coefficients: generalized least squares
Panels: heteroskedastic
Correlation: no autocorrelation

Estimated covariances = 50 Number of obs = 250
Estimated autocorrelations = 0 Number of groups = 50
Estimated coefficients = 4 Time periods = 5
Wald chi2(3) = 98.41
Log likelihood = -1019.364 Prob > chi2 = 0.0000

------------------------------------------------------------------------------
v12 | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
log | -41.35655 4.553634 -9.08 0.000 -50.28151 -32.43159
v7 | 13.37212 2.121515 6.30 0.000 9.214027 17.53021
v10 | 2.608105 1.382795 1.89 0.059 -.1021235 5.318334
_cons | -78.79583 19.00019 -4.15 0.000 -116.0355 -41.55614
------------------------------------------------------------------------------

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