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.
对样本含量估计的可靠性通过具有反馈的训练可能得到提高。
Reliability could possibly be improved by using a training set with feedback.
结果用实例说明了病例对照家系设计中样本含量估计方法的应用与影响因素和样本含量的关系。
Results Actual use of the method for estimating sample size and the relationship between effect factors and sample size were illustrated by a example of case control family study of liver cancer.
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