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How to calculate sample size and why
1Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea. kjhnav@naver.com
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.
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