Determine the availability of subjects for your research. Setting rigid qualifications for study subjects reduces the sample size due to the limited number of people meeting your standards.

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

By using a sample size calculator, you can figure out how many people is enough, ensuring confidence in your statistics.

In view of the fact that the sample size needed for a specified power does not vary linearly with effect size, the traditional approach typically leads to less power than is desired for the specified ...