Ferri,
Radar Charts are often used to compare two or more items or groups on various
features or characteristics. However, as the number of groups increases, the
user has a harder time making comparisons between groups. As the number of
groups increase, the number of spokes of the radar chart increases. Users in
general have a harder time comparing radial distances.You're better off using a
scatter plot for this. If however, you still want to create a radar chart, you
may want to the fmsb package.
Hope this helps!
Thomas SubiaStatistician
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