A general frailty model to accommodate individual heterogeneity in the acquisition of multiple infections: An application to bivariate current status data. (4th March 2020)

• Record Type: Journal Article
• Authors: Tran, Thao M.P.; Abrams, Steven; Braekers, Roel
• Is Part Of: Statistics in medicine. Volume 39:Number 12(2020)
• Page Start: 1695
• Page End: 1714
• Publication Date: 2020-03-04
• Subjects: association -- copula functions -- frailty models -- maximum likelihood inference -- serological survey data; Medical statistics -- Periodicals; Statistique médicale -- Périodiques; Statistiques médicales -- Périodiques; 610.727
• DOI: 10.1002/sim.8506
• Languages: English
• ISSNs: 0277-6715

Abstract

Abstract : The analysis of multivariate time‐to‐event (TTE) data can become complicated due to the presence of clustering, leading to dependence between multiple event times. For a long time, (conditional) frailty models and (marginal) copula models have been used to analyze clustered TTE data. In this article, we propose a general frailty model employing a copula function between the frailty terms to construct flexible (bivariate) frailty distributions with the application to current status data. The model has the advantage to impose a less restrictive correlation structure among latent frailty variables as compared to traditional frailty models. Specifically, our model uses a copula function to join the marginal distributions of the frailty vector. In this article, we considered different copula functions, and we relied on marginal gamma distributions due to their mathematical convenience. Based on a simulation study, our novel model outperformed the commonly used additive correlated gamma frailty model, especially in the case of a negative association between the frailties. At the end of the article, the new methodology is illustrated on real‐life data applications entailing bivariate serological survey data.