Question: Using the rats data set, t a Cox model for the effects of Ix and sex (without interaction) on the hazard of tumor onset using

Using the rats data set, t a Cox model for the

Using the rats data set, t a Cox model for the effects of Ix and sex (without interaction) on the hazard of tumor onset using the following methods for tied failure times. For each model, get point and interval estimates for the hazard ratios associated with rx and sex. How much does the choice of a method for tied failure times aect these estimates? (a) Breslow approximation (h) Efren approximation (e) Exact

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