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？