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Proportional hazards model
Class of statistical survival models
Proportional hazards model
Proportional hazards models are a class of survival models in statistics. Survival models relate the time that passes, before some event occurs, to one or more covariates that may be associated with that quantity of time. In a proportional hazards model, the unique effect of a unit increase in a covariate is multiplicative with respect to the hazard rate. The hazard rate at time t {\displaystyle t} is the probability per short time dt that an event will occur between t {\displaystyle t} and t + d t {\displaystyle t+dt} given that up to time t {\displaystyle t} no event has occurred yet. For example, taking a drug may halve one's hazard rate for a stroke occurring, or, changing the material from which a manufactured component is constructed, may double its hazard rate for failure. Other...
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