![Group processing in SAS: The NOTSORTED option](https://blogs.sas.com/content/iml/files/2016/01/notsorted1.png)
Novice SAS programmers quickly learn the advantages of using PROC SORT to sort data, followed by a BY-group analysis of the sorted data. A typical example is to analyze demographic data by state or by ZIP code. A BY statement enables you to produce multiple analyses from a single procedure