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。
Sample size formulae that control the width of confidence interval with a certain confidence level are proposed.
导出在一定置信水平下控制置信区间宽度的样本量公式。
Results Prespecified relative width may regulate and control the precision of confidence interval and may reflects magnitude of the sample size.
结果预设的相对宽度可调节和控制可信区间精度并决定样本含量的大小。
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