Identifying Unobserved Hazard Functions in Discrete-Time Survival Mixture Analysis |
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| Authors: | James Peugh Xitao Fan |
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| Institution: | 1. Cincinnati Children’s Hospital, Medical Center;2. University of Macau, China |
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| Abstract: | This Monte Carlo simulation adds to the growing body of enumeration index performance research in continuous response variable mixture models by addressing the issue of the performance of these indexes in discrete-time survival mixture analysis (DTSMA) models. Results showed that although all enumeration indexes performed very well in identifying a homogeneous DTSMA model (i.e., k = 1 hazard function in the sample data), the findings also showed that the enumeration indexes performed poorly in identifying the correct number of unobserved hazard functions present in a heterogeneous (i.e., k = 3) DTSMA model. More important, the performance of the enumeration indexes for the heterogeneous DTSMA models did not improve as the sample size, the effect of time-invariant covariates, or adjacent hazard function separation distance increased, which is inconsistent with some previous Monte Carlo simulation results. The limitations of this Monte Carlo simulation study and future empirical investigation possibilities are both discussed. |
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| Keywords: | Discrete time survival mixture analysis enumeration index hazard function mixture modeling Monte Carlo simulation |
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