我在做完固定效应估计后,用Xttest3和Xtserial命令分别估计了异方差和自相关情况,结果如下:
. xttest3
Modified Wald test for groupwise heteroskedasticity
in fixed effect regression model
H0: sigma(i)^2 = sigma^2 for all i
chi2 (11) = 244.23
Prob>chi2 = 0.0000
. xtserial y x1 x2 x3 x4 x5 x6
Wooldridge test for autocorrelation in panel data
H0: no first order autocorrelation
F( 1, 10) = 36.420
Prob > F = 0.0001
这两个估计结果是不是说明不存在异方差和自相关?


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