Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.
方法采用整群抽样调查搜集资料,采用多回归析筛选影响。
Methods To collect data by cluster sampling and analyze data by polychotomous Logistic regression.
方法采用整群抽样调查搜集资料,采用多回归析筛选影响。
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