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
    • General Medicine


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