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 ...

We derive an explicit form for power/sample size calculation based on these two tests. A number of simulation studies have been used to illustrate the efficiency of the tests for the case-cohort ...

Researchers can use a metric called the particle number concentration (PNC) to calculate the number of particles in a sample, ...

The authors propose a formula of sample size calculation by considering the number of groups, variances, and the noncentrality parameter. Because efficient algorithms for computing noncentral ...

This relationship also applies to another statistic sometimes needed for sample size calculations, which relates to variation. Take the case of the pain trial, where we are trying to see whether a ...

Recently, Cheung 20 presented a closed-form formula for sample size calculation, in which a nonparametric optimal design 21 was exploited and the accuracy index of the CRM design was derived ...