Counting your chickens before they're hatched: Power analysis

Daniel C. Jupiter

doi:10.1053/j.jfas.2014.05.001

Counting your chickens before they're hatched: Power analysis

Daniel C. Jupiter

Preventive Medicine & Community Health

Research output: Contribution to journal › Article

2 Scopus citations

Abstract

How does an investigator know that he has enough subjects in his study design to have the predicted outcomes appear statistically significant? In this Investigators' Corner I discuss why such planning is necessary, give an intuitive introduction to the calculations needed to determine required sample sizes, and hint at some of the more technical difficulties inherent in this aspect of study planning.

Original language	English (US)
Pages (from-to)	519-520
Number of pages	2
Journal	Journal of Foot and Ankle Surgery
Volume	53
Issue number	4
DOIs	https://doi.org/10.1053/j.jfas.2014.05.001
State	Published - Jul 2014

Keywords

Hypothesis testing
Power analysis
Sample size
Statistical significance
Type II error

ASJC Scopus subject areas

Orthopedics and Sports Medicine
Surgery
Medicine(all)

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10.1053/j.jfas.2014.05.001

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Jupiter, D. C. (2014). Counting your chickens before they're hatched: Power analysis. Journal of Foot and Ankle Surgery, 53(4), 519-520. https://doi.org/10.1053/j.jfas.2014.05.001

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