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A class of dynamic piecewise exponential models with random time grid. (English) Zbl 1227.62083

Summary: A novel fully Bayesian approach for modeling survival data with explanatory variables using the Piecewise Exponential Model (PEM) with random time grid is proposed. We consider a class of correlated gamma prior distributions for the failure rates. Such prior specification is obtained via the dynamic generalized modeling approach jointly with a random time grid for the PEM. A product distribution is considered for modeling the prior uncertainty about the random time grid, turning possible the use of the structure of the Product Partition Model (PPM) to handle the problem. A unifying notation for the construction of the likelihood function of the PEM, suitable for both static and dynamic modeling approaches, is considered. Procedures to evaluate the performance of the proposed model are provided. Two case studies are presented in order to exemplify the methodology. For comparison purposes, the data sets are also fitted using the dynamic model with fixed time grid established in the literature. The results show the superiority of the proposed model.

MSC:

62N02 Estimation in survival analysis and censored data
62F15 Bayesian inference
65C60 Computational problems in statistics (MSC2010)

Software:

SEER*Stat; Ox
PDFBibTeX XMLCite
Full Text: DOI

References:

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