In this paperwe present a general framework for themodelling of the process of corrective and condition-based preventive maintenance actions for complex repairable systems. A new class of models is proposed, the generalized virtual age models. On the one hand, these models generalize Kijima’s virtual age models to the case where both preventive and corrective maintenances are present. On the ot...

BACKGROUND When a patient experiences an event other than the one of interest in the study, usually the probability of experiencing the event of interest is altered. By contrast, disease-free survival time analysis by standard methods, such as the Kaplan-Meier method and the standard Cox model, does not distinguish different causes in the presence of competing risks. Alternative approaches use ...

Approved: Thesis Supervisor Title and Department

Publicly traded companies can leave a public system by bankruptcy or an exit due to merger. Discrete sub-hazard functions are modeled with a multinomial logit model. For 12,571 U.S. industrial firms spanning 1980 to 2004, quarterly firm specific financial variables and macroeconomic variables are available. Time-varying baseline hazard functions may capture unobservable or missing macroeconomic...

The nonparametric predictive inference (NPI) approach for competing risks data has recently been presented, in particular addressing the question due to which of the competing risks the next unit will fail, and also considering the effects of unobserved, re-defined, unknown or removed competing risks. In this paper, we introduce how the NPI approach can be used to deal with situations where uni...