Cox Regression with a Time-Dependent Covariate

A government law enforcement agency is concerned about recidivism rates in their area of jurisdiction. One of the measures of recidivism is the time until second arrest for offenders. The agency would like to model time to rearrest using Cox Regression, but are worried the proportional hazards assumption is invalid across age categories.

The data file recidivism.sav contains, among other information, the ages and time to second arrest for a random sample of offenders. See the topic Sample Files for more information. Use Cox Regression to assess the proportional hazards assumption with respect to age.

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