在做面板数据的 Hausman检验时,居然报错,说
Test: Ho: difference in coefficients not systematic
chi2(6) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= -36.24 chi2<0 ==> model fitted on these
data fails to meet the asymptotic
assumptions of the Hausman test;
see suest for a generalized test
请问高手,这是什么意思,什么地方搞错了呢。