Artículos de revistas
Influence diagnostics for polyhazard models in the presence of covariates
Fecha
2008Registro en:
STATISTICAL METHODS AND APPLICATIONS, v.17, n.4, p.413-433, 2008
1618-2510
10.1007/s10260-007-0067-3
Autor
FACHINI, Juliana B.
ORTEGA, Edwin M. M.
LOUZADA-NETO, Francisco
Institución
Resumen
In this paper, we present various diagnostic methods for polyhazard models. Polyhazard models are a flexible family for fitting lifetime data. Their main advantage over the single hazard models, such as the Weibull and the log-logistic models, is to include a large amount of nonmonotone hazard shapes, as bathtub and multimodal curves. Some influence methods, such as the local influence and total local influence of an individual are derived, analyzed and discussed. A discussion of the computation of the likelihood displacement as well as the normal curvature in the local influence method are presented. Finally, an example with real data is given for illustration.