coverage error
... mean_squared_error ：平均平方误差 coverage_error ：涵盖误差 adjusted_mutual_info_score ：调整的互信息评分 ...
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未涵盖误差 Non-coverage Error
最后在模拟测试之下，利用最大概似估计法求得各参数的误差、均方根误差、参数之上下界限以及涵盖。
Simulation results show that the maximum likelihood estimates perform well in most cases in terms of the mean bias, errors in the root mean square and the coverage rate.
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