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## Hazard ratioThe ## Additional recommended knowledgeThe instantaneous hazard rate is the limit of the number of events per unit time divided by the number at risk as the time interval decreases. where The Such models are generally classed proportional hazards regression models (they differ in their treatment of For two individuals who differ only in the relevant membership (e.g. treatment vs control) their predicted log-hazard will differ additively by the relevant parameter estimate, which is to say that their predicted hazard rate will differ by For a continuous explanatory variable, the same interpretation applies to a unit difference. Other hazard rate models have different formulations and the interpretation of the parameter estimates differs accordingly. ## See also- Survival analysis
- Failure rate and Hazard rate
- Proportional hazards models
- Odds ratio
- Relative risk ratio
## References- Altman, DG. Practical Statistics for Medical Research. Chapman & Hall. London, 1991.
__ISBN 0-412-27630-5__. pp383-4. - Altman on Kaplan-Meier estimator
Categories: Survival analysis | Epidemiology |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hazard_ratio". A list of authors is available in Wikipedia. |