Which of the following is NOT a function of the SORT procedure in SAS?

The SORT procedure in SAS is primarily used to arrange the observations in a dataset in a specific order based on the values of one or more variables. This means that sorting and organizing data for better analysis and reporting is a core functionality of the SORT procedure.

The option relating to grouping observations or printing column subtotals is also accurate, as the results of the SORT procedure can enhance report generation by organizing the data in a way that makes it easier to see relationships and patterns.

However, the calculation of mean values of variables is not a function of the SORT procedure. Instead, calculating statistical measures like means is typically performed using procedures such as PROC MEANS or PROC SUMMARY. These procedures are designed to analyze data and generate statistical summaries, while the SORT procedure's primary focus is solely on the ordering of data.

Thus, identifying calculating mean values of variables as an option that does not belong to the functions of the SORT procedure is correct and demonstrates an understanding of the distinct objectives of different SAS procedures.