Sample size determinations can be finished by hand or through one of the numerous accessible software packages, for example, SAS and R. This blog is about the comparison between SAS and R Programming.

Table 1 below shows that if the groups are of equal size (a 1:1 ratio), then the power is 0.87. The study has an 87% chance of detecting a true difference in birth weight of 250g. The power reduces as ...

Design is essential for the quality of every clinical and epidemiological study and sample size calculation is an essential component of study design (1). For methodological reasons, the sample ...

Because the number of published clinical trials on coronavirus disease 2019 (COVID-19) patients has been increasing rapidly, I have reviewed all these trials published between Jan. 1, 2020, and Mar.