Clin Orthop Surg.  2013 Sep;5(3):235-242. 10.4055/cios.2013.5.3.235.

How to Calculate Sample Size and Why

Affiliations
  • 1Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea. kjhnav@naver.com

Abstract

WHY: Calculating the sample size is essential to reduce the cost of a study and to prove the hypothesis effectively. HOW: Referring to pilot studies and previous research studies, we can choose a proper hypothesis and simplify the studies by using a website or Microsoft Excel sheet that contains formulas for calculating sample size in the beginning stage of the study. MORE: There are numerous formulas for calculating the sample size for complicated statistics and studies, but most studies can use basic calculating methods for sample size calculation.

Keyword

Sample size
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