This is a preview. Log in through your library . Abstract Cluster randomization trials with relatively few clusters have been widely used in recent years for evaluation of health-care strategies. On ...

Data collection is sometimes performed without considering the effect poorly collected data has in the strength of statistical conclusions. When researchers properly design an experiment, they are ...

This is a preview. Log in through your library . Abstract A large-sample nonparametric version of Williams' test for comparing increasing doses of a substance with a zero-dose control response is ...