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Clin Orthop Surg. 2013 Sep;5(3):235-42. doi: 10.4055/cios.2013.5.3.235. Epub 2013 Aug 20.

How to calculate sample size and why.

Author information

1
Department 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.

KEYWORDS:

Sample size

PMID:
24009911
PMCID:
PMC3758995
DOI:
10.4055/cios.2013.5.3.235
[Indexed for MEDLINE]
Free PMC Article

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