Counting your chickens before they're hatched: Power analysis

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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 languageEnglish (US)
Pages (from-to)519-520
Number of pages2
JournalJournal of Foot and Ankle Surgery
Issue number4
StatePublished - Jul 2014


  • 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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