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- W2069082852 abstract "For progressive diseases, it is often not so straightforward to define an onset time of certain disease condition due to disease fluctuation and clinical measurement variation. When a disease onset is claimed through the first presence of some clinical event which is subject to large measurement error, such onset time could be difficult to interpret if patients can often be seen to recover from the disease condition automatically. We generalize the traditional event onset time concept to control the recovery probability through the use of a stochastic process model. A simulation algorithm is provided to evaluate the recovery probability numerically. Bayesian latent residuals are developed for model assessment. This methodology is applied to define a new postural instability onset time measure using data from a Parkinson's disease clinical trial. We show that our latent model not only captures the essential clinical features of a postural instability process, but also outperforms independent probit model and random effects model. A table of estimated recovery probabilities is provided for patients under various baseline disease conditions. This table can help physicians to determine the new postural instability onset time when different thresholds of estimated recovery probability are used in clinical practice." @default.
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- W2069082852 date "2009-01-01" @default.
- W2069082852 modified "2023-09-28" @default.
- W2069082852 title "A latent model approach to define event onset time in the presence of measurement error" @default.
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- W2069082852 doi "https://doi.org/10.4310/sii.2009.v2.n4.a4" @default.
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