The Survival Kit: software to analyze survival data including possibly correlated random effects
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G Mészáros1, J Sölkner, V Ducrocq
1Division of Livestock Sciences, University of Natural Resources and Life Sciences, Vienna, Gregor-Mendel-Str. 33, A-1180 Vienna, Austria. gabor.meszaros@boku.ac.at
Abstract:
The Survival Kit is a Fortran 90 Software intended for survival analysis using proportional hazards models and their extension to frailty models with a single response time. The hazard function is described as the product of a baseline hazard function and a positive (exponential) function of possibly time-dependent fixed and random covariates. Stratified Cox, grouped data and Weibull models can be used. Random effects can be either log-gamma or normally distributed and can account for a pedigree structure. Variance parameters are estimated in a Bayesian context. It is possible to account for the correlated nature of two random effects either by specifying a known correlation coefficient or estimating it from the data. An R interface of the Survival Kit provides a user friendly way to run the software.
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