Semiparametric Bayesian Models for Clustering and Classification in the Presence of Unbalanced In-Hospital Survival. Issue 1 (11th July 2013)

• Record Type: Journal Article
• Authors: Guglielmi, Alessandra; Ieva, Francesca; Paganoni, Anna M.; Ruggeri, Fabrizio; Soriano, Jacopo
• Is Part Of: Journal of the Royal Statistical Society. Volume 63:Issue 1(2014:Jan.)
• Page Start: 25
• Page End: 46
• Publication Date: 2013-07-11
• Subjects: Bayesian clustering -- Bayesian non-parametrics -- Random-effects models -- Random partitions -- Unbalanced binary outcomes; Statistics -- Periodicals; 519.5
• DOI: 10.1111/rssc.12021
• Languages: English
• ISSNs: 0035-9254

Abstract

Summary: Bayesian semiparametric logit models are fitted to grouped data related to in-hospital survival outcome of patients hospitalized with an ST -segment elevation myocardial infarction diagnosis. Dependent Dirichlet process priors are considered for modelling the random-effects distribution of the grouping factor (hospital of admission), to provide a cluster analysis of the hospitals. The clustering structure is highlighted through the optimal random partition that minimizes the posterior expected value of a suitable loss function. There are two main goals of the work: to provide model-based clustering and ranking of the providers according to the similarity of their effect on patients' outcomes, and to make reliable predictions on the survival outcome at the patient's level, even when the survival rate itself is strongly unbalanced. The study is within a project, named the 'Strategic program of Regione Lombardia', and is aimed at supporting decisions in healthcare policies.