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Ratio of the hazard rates corresponding to the conditions described by two levels of an explanatory variable
In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a treatment variable of interest. For example, in a clinical study of a drug, the treated population may die at twice the rate per unit time of the control population. The hazard ratio would be 2, indicating a higher hazard of death from the treatment... Wikipedia