xtserial  NFA_gdp_ratio ln_pgdp ln_pgdp2

Wooldridge test for autocorrelation in panel data
H0: no first order autocorrelation
    F(  1,  173) =     64.264
    Prob > F =      0.0000

xttest3

Modified Wald test for groupwise heteroskedasticity
in fixed effect regression model
H0: sigma(i)^2 = sigma^2 for all i
chi2 (175)  =   8.0e+06
Prob>chi2 =      0.0000

请问这两个命令的结论分别是？