Cluster randomized trials in health care may involve three instead of two levels, for instance, in trials where different interventions to improve quality of care are compared. In such trials, the ...

Cluster randomized trials (CRTs) represent a pivotal design in evaluating public health and clinical interventions where individuals are grouped into clusters (such as schools, hospitals or ...

The inefficiency induced by between-cluster variation in cluster randomized (CR) trials can be reduced by implementing a crossover (CO) design. In a simple CO trial, each subject receives each ...

The authors assessed the effect of provider education and clinical decision support (CDS) on antibiotic prescribing for acute sinusitis. Education and CDS improved antibiotic stewardship and changed ...

The random sample survey is a commonly used method in market research and such surveys generally are considered to provide more robust results than purposive or convenience (such as quota) samples.