Click here to see the SAS code.
Click here to see the example.
I did this custom/annotate chart because "proc gradar" wouldn't quite
do this kind (not even the windrose chart).
First I annotate 4 pie slices for the 4 quadrants of the pie.
Then I annotate 'empty' pies to do the circles inside the larger pie.
The 'spokes' represent how many flights went in that compass direction.
I created them using annotate 'move/draw' lines, with a very thick
width (ie, size).
One limitation is that annotated lines do not allow charttips or
drilldown. As a workaround, you could annotate a pie/dot at the
end of each line segment, and use the dot for the charttip and drilldown.
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