Click here to see the SAS code.
Click here to see the example.

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This is a SAS/Graph implementation of charts like this:



Each 360-degree circle around the spiral is 1 year of data.
Each line segment represents a day (~365 days a year).
You could have fewer than 365 days, but the days still need to
be numbered with their day-of-year numbering sequence (1-365).

This example just uses random data - you'd want to swap in your
own real data, and modify the if/else to suit your own coloring
desires.

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