Rx Note

Introduction Fundamentally, research seeks to uncover new knowledge. Sample size calculation determines the optimal number of participants required for a study. This balance ensures sufficient statistical power to detect meaningful effects while minimizing unnecessary resource expenditure and ethical implications , particularly in areas like drug trials. Moreover, in studies with large sample, even small effect becomes significant, whereas in small sample, a large effect may not be significant. Numerous statistical software packages are available (e.g., SPSS, R program, PS: Power and Sample Size Calculation ), and their use should be clearly specified within research studies. Key Elements of Sample Size Calculation Type of research question and associated designs Therapeutic Randomized controlled trials (RCTs) for binomial (e.g., success/failure) or continuous outcomes (e.g., blood pressure). Aetiology Cohort or case-control studies, with considerations for confounders and effect siz...