ivreg2后ivendog的结果：


Tests of endogeneity of: x1 x2
H0: Regressors are exogenous
    Wu-Hausman F test:                  5.32266  F(2,1224)   P-value = 0.00499
    Durbin-Wu-Hausman chi-sq test:     10.70872  Chi-sq(2)   P-value = 0.00473

Tests of endogeneity of: x1
H0: Regressor is exogenous
    Wu-Hausman F test:                  1.86877  F(1,1225)   P-value = 0.17187
    Durbin-Wu-Hausman chi-sq test:      1.89181  Chi-sq(1)   P-value = 0.16900

Tests of endogeneity of: x2
H0: Regressor is exogenous
    Wu-Hausman F test:                  0.59057  F(1,1225)   P-value = 0.44235
    Durbin-Wu-Hausman chi-sq test:      0.59848  Chi-sq(1)   P-value = 0.43916

这个结果如何解释呢，说明x1，x2哪一个是内生的？还是都内生？都外生？

谢谢！