sample size calculations (sometimes called "power" calculations). Here is the easy bit: you give me some numbers, I plug them into a formula and tell you how many patients you need. The formula ...

Power 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 sample size for ...

Power 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 sample size for ...

State the factors that affect power and what factors we have to specify to do a sample size calculation. Some notes on the behaviour of sample size calculations and power for unequal group sizes This ...

Choosing the proper sample size for an investigation is one of the crucial jobs required of a statistician. Regardless of whether the statistician is deciding the number of patients to select in a ...

1. Röhrig B, du Prel JB, Blettner M: Study design in medical research – Part 2 of a series on evaluation of scientific publications [Studiendesign in der medizinischen Forschung. Teil 2 der ...