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Exercise

Visualizing a Cox model

In this exercise we will reproduce the example from the video following the steps:

  • Compute Cox model
  • Decide on "imaginary patients"
  • Compute survival curves
  • Create data.frame with survival curve information
  • Plot

We will focus now on the last two steps in this exercise.

The survival and survminer packages and the GBSG2 data are loaded for you in this exercise. The Cox model cxmod, the imaginary patient data newdat, and the survival curve information cxsf from the previous exercise are also available.

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  • Use the surv_summary() function to compute the data.frame we need for plotting the survival curves. Use cxsf (see pre-exercise code).
  • Take a look at the object surv_cxmod0 using head() and inspect the different columns.
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