chapter  5
24 Pages

Frailty Models

Frailty models are mixed-effects models for survival data. The terminology

originates from medical science, where the word frailty denotes a general

susceptibility to ill health. As a random effect, a frailty term can be specified

for an individual, but can also be cluster-specific in which case individuals

within clusters share the same frailty. Applications of frailty models are not

limited to medical science but can also be found in other disciplines where

survival analysis is undertaken.