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 ...

Our sample size formula includes several existing formulas as special cases when the working variance function is correctly specified as the true variance function. We also consider a sensitivity ...

Some notes on the behaviour of sample size calculations and power for unequal group sizes This information was omitted from the video and so is included here as text. In many scenarios the ratio of ...

Formal sample size calculation can help us think through what patient-based research can and cannot tell us about medicine.

The formula for the sample size for a difference from a mean is: where tα and tβ are the one sided t distribution values for the given α and β risk levels selected and S2 is the variance of the total ...