Exercise

Computing a Cox model

We have a dataset of lung cancer patients. We want to know if their performance score (variable performance) is associated with their survival time. The performance score measures how well a patient can perform usual daily activities (bad=0, good=100).

The survival package and the dat dataset are already loaded for you.

Instructions 1/2

XP

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Compute a Cox model for the lung cancer data dat using coxph() to estimate the effect of the performance score (variable performance) on the survival of lung cancer patients.
Use the coef() function to show the model coefficient.