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The PHREG Procedure |

Let and denote the
*i*th component of and , respectively.
The hazards ratio (also known as risk ratio)
for the explanatory variable with
regression coefficient is defined as
.The hazards ratio is estimated by
.
The confidence limits
for the hazards ratio are calculated as

The hazards ratio is the ratio of the hazards functions that correspond to a change of one unit of the given variable and conditional on fixed values of all other variables.

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