st: negative LR chi2(10)value

[jjc.li@utoronto.ca]

Dear all,

I am doing Loglikelihood Ratio Test by stata, after -sureg-. There's  
an abnomal output:

LR chi2(10) =  -6.64

I am wondering what cause the problem and how to analyze the result.  
The critical chi2 value is 18.31. Should I reject or accept the null  
hypothesis?

Thanks!

Jingjing Li
University of Toronto

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