Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.
方法群抽样调查搜集资料,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.
方法群抽样调查搜集资料,多分类回归分析筛选影响因素。
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