Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.
方法采用整群抽样集资料,采用多分类回归分析筛选影响因素。
Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.
方法采用整群抽样集资料,采用多分类回归分析筛选影响因素。
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