Objective Discussing sample size estimation method and effect factors for case control family design.
目的探讨病例对照家系设计中样本含量的估算方法及影响因素。
Objective: To introduce the methods for sample size estimation based on width of confidence interval.
目的：介绍基于置信区间宽度的样本含量估计方法。
Objective: To introduce the methods for sample size estimation based on width of confidence interval.
目的：介绍基于置信区间宽度的样本含量估计方法。
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