In the Two-Sample Test for Proportions task, you can determine whether two probabilities are the same. The data analyzed in this example are taken from a study measuring the accuracy of two computer ...

Potential misclassification of a binary outcome measure is often ignored in study design, causing considerable loss of power, and threatening the quality of research. Although there exist studies ...

In some situations, a standard (known) value (p 0) is available for the expected proportion of nonconforming items, based on extensive testing or previous sampling. This example illustrates how you ...

What is stratified random sampling? Stratified random sampling is the technique of breaking the population of interest into groups (called strata) and selecting a random sample from within each of ...

Pilot trials have a key role in preparing for definitive randomized trials, yet determining their sample size remains a common challenge. This article provides practical guidance, methods, and ...