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目的 :论述病例 对照研究设计中样本大小与统计功效估计方法。方法 :采用常用便于编写电脑软件的计算公式。结果 :作了较清晰说明 ,并列举了示例结果
Objective: To discuss the method of sample size and statistical power estimation in case-control study design. Method : Use a formula that is commonly used to easily write computer software. Results : Made clearer and listed example results