The hazard ratio (HR) is a statistical measure used primarily in survival analysis to compare the risk of an event (such as death, failure, or relapse) occurring at any given time in two different groups. It quantifies the relationship between the rate of the event occurring in a treatment group and a control group over a specified time period. ### Key Points about Hazard Ratio: 1. **Definition**: The hazard ratio compares the hazard (the instant risk of the event happening) between two groups.
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