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。
The calculation formulas of sample size based on the error limitation are given for estimation of population mean.
对于样本均值估计总体均值，给出了基于误差限制的样本容量的计算式。
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