Narrative review outlines sample size calculation methods across study designs in medical research, highlighting the necessity of design-specific statistical formulas.
Calculation of exact sample size is an important part of research design. It is very important to understand that different study design need different method of sample size calculation and one formula cannot be used in all designs. In this short review we tried to educate researcher regarding various method of sample size calculation available for different study designs. In this review sample size calculation for most frequently used study designs are mentioned. For genetic and microbiological studies readers are requested to read other sources.
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Charan et al. (2013) studied this question.
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