Hello R users,
I'm trying to learn how to make a plot with the amazing package ggplot2.
I was wondering if it was possible to draw 2 (or more) x (or y) axis in the
same graph. For example :
- I want to show two informations at each x coordinate : a survival curve,
I want to show the time (0, 12 and 24 months) and the number of subject at
risk at each time.
- I want to draw two curves that don't have the same unit
Thank you very much.
david
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