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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11643

Title: Quantile dispersion graphs to compare the efficiencies of cluster randomized designs
Authors: MUKHOPADHYAY, S
LOONEY, SW
Keywords: community intervention
intraclass correlation
smoking prevention
adolescent tobacco
trials
variance
models
components
errors
Issue Date: 2009
Publisher: ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Citation: JOURNAL OF APPLIED STATISTICS, 36(11), 1293-1305
Abstract: The purpose of this article is to compare efficiencies of several cluster randomized designs using the method of quantile dispersion graphs (QDGs). A cluster randomized design is considered whenever subjects are randomized at a group level but analyzed at the individual level. A prior knowledge of the correlation existing between subjects within the same cluster is necessary to design these cluster randomized trials. Using the QDG approach, we are able to compare several cluster randomized designs without requiring any information on the intracluster correlation. For a given design, several quantiles of the power function, which are directly related to the effect size, are obtained for several effect sizes. The quantiles depend on the intracluster correlation present in the model. The dispersion of these quantiles over the space of the unknown intracluster correlation is determined, and then depicted by the QDGs. Two applications of the proposed methodology are presented.
URI: http://dx.doi.org/10.1080/02664760902914508
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11643
http://hdl.handle.net/10054/11643
ISSN: 0266-4763
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