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.

Instructions 1/3

**undefined XP**

- 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.