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Exercise

Capstone: The Cox model

To conclude the course, let's take a look back at the lung cancer dataset we utilized briefly in these last 2 chapters. To recap, this dataset contains information on the survival of patients with advanced lung cancer from the North Central Cancer Treatment Group. The event is stored in the status variable, which has a value of 2 if an individual did not survive. The performance score (variable performance) measures how well a patient can perform usual daily activities (bad=0, good=100), rated by a physician. We want to know the association between specific performance scores and survival time.

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  • Create a Cox model that takes the survival time and event of death as a response and performance score as an extra term.
  • Create a data frame of performance values 60, 70, 80, and 90, and use that to create survival curves.
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