ESTIMATING SAMPLE SIZES FOR BINARY, ORDERED CATEGORICAL, AND CONTINUOUS OUTCOMES IN 2 GROUP COMPARISONS

被引：354

作者：

CAMPBELL, MJ ^{[1
]}

JULIOUS, SA ^{[1
]}

ALTMAN, DG ^{[1
]}

机构：

[1] IMPERIAL CANC RES FUND,MED STAT LAB,LONDON WC2A 3PX,ENGLAND

来源：

BRITISH MEDICAL JOURNAL | 1995年 / 311卷 / 7013期

关键词：

D O I：

10.1136/bmj.311.7013.1145

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

Sample size calculations are now mandatory for many research protocols, but the ones useful in common situations are not all easily accessible. This paper outlines the ways of calculating sample sizes in two group studies for binary, ordered categorical, and continuous outcomes. Formulas and worked examples are given. Maximum power is usually achieved by having equal numbers in the two groups. However, this is not always possible and calculations for unequal group sizes are given.

引用

页码：1145 / 1148

页数：4

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