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Coarsened disease histories are then obtained from consenting family members, either through examining medical records, retrospective reporting, or clinical examination. Methods for dealing with such biased sampling schemes are available for continuous, binary, and failure time responses, but methods for more complex life history processes are less developed. We consider a simple joint model for clustered illness-death processes which we formulate to study covariate effects on the marginal intensity for disease onset and to study the within-family dependence in disease onset times. We construct likelihoods and composite likelihoods for family data obtained from biased sampling schemes. In settings where the disease is rare and data are insufficient to fit the model of interest, we show how auxiliary data can augment the composite likelihood to facilitate estimation. We apply the proposed methods to analyze data from a family study of psoriatic arthritis carried out at the University of Toronto Psoriatic Arthritis Registry.<\/jats:p>","DOI":"10.1093\/biostatistics\/kxz048","type":"journal-article","created":{"date-parts":[[2019,10,25]],"date-time":"2019-10-25T19:19:35Z","timestamp":1572031175000},"page":"482-503","source":"Crossref","is-referenced-by-count":2,"title":["The illness-death model for family studies"],"prefix":"10.1093","volume":"22","author":[{"given":"Jooyoung","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Statistics and Actuarial Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard J","family":"Cook","sequence":"additional","affiliation":[{"name":"Department of Statistics and Actuarial Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, 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