Klein Entink, RH;
van den Hout, A;
A mixture model for the joint analysis of latent developmental trajectories and survival.
Statistics in Medicine
2310 - 2325.
Van Den Hout_SMMR_2011_ForUCL_OpenAccess.pdf
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A general joint modeling framework is proposed that includes a parametric stratified survival component for continuous time survival data, and a mixture multilevel item response component to model latent developmental trajectories given mixed discrete response data. The joint model is illustrated in a real data setting, where the utility of longitudinally measured cognitive function as a predictor for survival is investigated in a group of elderly persons. The object is partly to determine whether cognitive impairment is accompanied by a higher mortality rate. Time-dependent cognitive function is measured using the generalized partial credit model given occasion-specific mini-mental state examination response data. A parametric survival model is applied for the survival information, and cognitive function as a continuous latent variable is included as a time-dependent explanatory variable along with other explanatory information. A mixture model is defined, which incorporates the latent developmental trajectory and the survival component. The mixture model captures the heterogeneity in the developmental trajectories that could not be fully explained by the multilevel item response model and other explanatory variables. A Bayesian modeling approach is pursued, where a Markov chain Monte Carlo algorithm is developed for simultaneous estimation of the joint model parameters. Practical issues as model building and assessment are addressed using the DIC and various posterior predictive tests.
|Title:||A mixture model for the joint analysis of latent developmental trajectories and survival|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||This is the peer reviewed version of the following article: Klein Entink, R. H., Fox, J.-P. and van den Hout, A. (2011), A mixture model for the joint analysis of latent developmental trajectories and survival. Statist. Med., 30: 2310–2325. doi:10.1002/sim.4266, which has been published in final form at http://dx/doi.org/10.1002/sim.4266. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-820227.html).|
|Keywords:||Aged, Bayes Theorem, Cognition, Female, Humans, Male, Markov Chains, Models, Statistical, Monte Carlo Method, Questionnaires, Survival Analysis|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
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