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In studies following selective sampling protocols for secondary outcomes, conventional analyses regarding their appearance could provide misguided information. In the large type 1 diabetes prevention and prediction (DIPP) cohort study monitoring type 1 diabetes‐associated autoantibodies, we propose to model their appearance via a multivariate frailty model, which incorporates a correlation component...
The Wilcoxon rank‐sum test is a popular nonparametric test for comparing two independent populations (groups). In recent years, there have been renewed attempts in extending the Wilcoxon rank sum test for clustered data, one of which (Datta and Satten, 2005, Journal of the American Statistical Association100, 908–915) addresses the issue of informative cluster size, i.e., when the outcomes and the...
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