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![A trick to plot groups in PROC SGPLOT](https://blogs.sas.com/content/iml/files/2018/10/GroupFreq3-640x336.png)
A useful feature in PROC SGPLOT is the ability to easily visualize subgroups of data. Most statements in the SGPLOT procedure support a GROUP= option that enables you to overlay plots of subgroups. When you use the GROUP= option, observations are assigned attributes (colors, line patterns, symbols, ...) that indicate