Semiparametric analysis of correlated and interval-censored event-history data

Statistical Methods in Medical Research
Daewoo PakDavid Todem

Abstract

We propose a semiparametric multi-state frailty model to analyze clustered event-history data subject to interval censoring. The proposed model is motivated by an attempt to study the life course of dental caries at the tooth level, taking into account the multiplicity of caries states and the intra-oral clustering of observations made at periodic time points. Of particular interest is the study of the intra-oral distribution of processes leading to carious lesions, and whether this distribution varies with gender. The model assumes, in view of the covariate profile, a proportionality of the transition intensities conditional on subject-level frailties, coupled with a linear spline approximation of the log baseline intensities. The model estimation is conducted using a penalized likelihood where the smoothing parameters are estimated as reciprocal variance components under a mixed-model representation. A Bayesian method is proposed to predict tooth-level caries transition probabilities, which can be used for tailoring tooth-level caries treatment and prevention plans. Intensive simulation studies indicate that the model fitting and prediction perform reasonably well under realistic sample sizes. The practical utility of the met...Continue Reading

References

Nov 7, 2003·Biometrics·Tianxi Cai, Rebecca A Betensky
Aug 6, 2009·Statistical Methods in Medical Research·Zhigang Zhang, Jianguo Sun
Jan 31, 2013·Statistical Methods in Medical Research·Il Do HaYoungjo Lee

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Citations

Feb 8, 2020·Journal of Dental Research·M DuM Mittinty

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