Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Frailty Model"”.
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Evaluating Time-varying Effect in Single-type and Multi-type Semi-parametric Recurrent Event Models
… and time-varying factors in recurrent events modeling context. The research is motivated by the traffic safety research question of evaluating the influence of crash on driving risk and driver behavior. The methodologies developed, however, are general and can be applied to other fields. Four …
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Bayesian Hierarchical Frailty Models for Heterogeneity in Risk
… is most commonly estimated with the Cox model, which assumes proportional hazards. When heterogeneity in risk is present, the assumption of proportionality is violated and the Cox model's population-averaged estimate of the hazard ratio can underestimate the effect for an individual. In …
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Antidepressant Persistence Before and After the Introduction of Online Renewal
… of the chosen methods, a mixed effects Cox model with a random intercept, i.e. a frailty model, and a linear probability model with a difference-in-differences estimator and patient fixed effects. While the results of the frailty models without time controls estimated that the hazard of …
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Modelling hepatotoxicity in HIV/TB co-infected patients: extensions of the Cox Proportional Hazards Model
… objectives are to fit a Cox regression model, the resolution model of hepatotoxicity, and the extended Cox models for recurring events, including the Andersen Gill (AG) model, the Shared frailty model, the Prentice, Williams and Peterson (PWP) total time (TT) model, the PWP gap time (GT) …
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Joint Modeling of Tumor Size and Time-to-Event
… component) are often collected. In order to model these two components simultaneously, the joint modeling approach which can reduce potential biases and improve the efficiency in estimating treatment effects becomes increasingly important. In this work, we proposed a joint model where a …
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Modeling Mortality of Loblolly Pine Plantations
… Whole-stand and individual-tree mortality models were developed for loblolly pine plantations throughout its geographic range in the United States. The model for predicting stand mortality were developed using stand characteristics and biophysical variables. The models were constructed …
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Modelling survival in HIV cohorts with applications to data from Zomba, Malawi
… sarcoma during routine initiation of ART, (2) to model the survival pattern among HIV patients diagnosed with KS, (3) to model local geographical variations in survival among HIV patients on ART, (4) to quantify transition dynamics in HIV and TB co-infection using multi-state modelling. For the …