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ERIC Number: EJ1171236
Record Type: Journal
Publication Date: 2018-Apr
Pages: 23
Abstractor: As Provided
ISSN: ISSN-1076-9986
The Design of Cluster Randomized Trials with Random Cross-Classifications
Moerbeek, Mirjam; Safarkhani, Maryam
Journal of Educational and Behavioral Statistics, v43 n2 p159-181 Apr 2018
Data from cluster randomized trials do not always have a pure hierarchical structure. For instance, students are nested within schools that may be crossed by neighborhoods, and soldiers are nested within army units that may be crossed by mental health-care professionals. It is important that the random cross-classification is taken into account while planning a cluster randomized trial. This article presents sample size equations, such that a desired power level is achieved for the test on treatment effect. Furthermore, it also presents optimal sample sizes given a budgetary constraint, with a special focus on conditional optimal designs where one of the sample sizes is fixed beforehand. The optimal design methodology is illustrated using a postdeployment training to reduce ill-health in armed forces personnel.
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A