Correlated Random Effects - Hausman Test   
Pool: EXRETURN   
Test cross-section random effects   
   
Test Summary  Chi-Sq. Statistic Chi-Sq. d.f. Prob.
   
Cross-section random  213.233008   4    0.0000
   
** Warning: estimated cross-section random effects variance is zero.   

看P-value，应该拒绝原假设，用固定效应模型，可是上面estimated cross-section random effects variance is zero.这句话貌似有说明用随机效应模型
请问到底用那个模型啊？？？