Statistics review 4: Sample size calculations

被引：0
|
作者：
Elise Whitley
Jonathan Ball
机构：
[1] Lecturer in Medical Statistics,
[2] University of Bristol,undefined
[3] Lecturer in Intensive Care Medicine,undefined
[4] St George's Hospital Medical School,undefined
来源：
Critical Care | / 6卷 / 4期
关键词：
statistical power; sample size;
D O I：
10.1186/cc1521
中图分类号：
学科分类号：
摘要：
The present review introduces the notion of statistical power and the hazard of under-powered studies. The problem of how to calculate an ideal sample size is also discussed within the context of factors that affect power, and specific methods for the calculation of sample size are presented for two common scenarios, along with extensions to the simplest case.
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