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Showing 1 to 4 of 4 for “"Intracluster correlation"”.
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Comparison of Intracluster Correlation Coefficient Estimates For Binary Variables
… standard deviation of fourteen estimators of the intracluster correlation for binary data. The comparisons were performed in an extensive simulation study. The correlated binary data, assuming an exchangeable correlation structure were simulated incorporating variations of overall event rate, …
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Design and Monitoring of Clinical Trials with Clustered Time-to-Event Endpoint
… randomization trials; accordingly, we derive the intracluster correlation coefficient for clustered time-to-event endpoint. We find that the required number of clusters is affected not only by the mean cluster size, but also by the variance of cluster size distribution. In addition, we prove that …
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Power and Sample Size for Three-Level Cluster Designs
… the nesting effect introduces more than one intracluster correlation into the model. Second, the variance structure of the estimated treatment difference is more complicated. Third, sample size results required for several levels are needed. In this work, we developed sample size and power …
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Techniques for handling clustered binary data
… This cluster effect is quantified by the intracluster correlation and needs to be taken into account when estimating proportions, comparing proportions and in sample size calculations. In the context of observational studies, the effect of clustering is expressed by the design effect which …