st: To compare outcome of different measurement tools

["Ziad El-Khatib" <Ziad.El-Khatib@ki.se>]

Hi
We used 3 different ways to measure an outcome (method a, method b, method c).
I manage to plot them in bar chart, but sometimes there are missing
data for some patients, so is it possible to calculate the variations
between these methods using the same patient?

Thank you and best regards
ziad
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