All the by variables are sorted in ascending order by default. Variables to be sorted by descending order should be preceded by the word descending, which is what you are doing in your code. You are sorting the whole table by: RBC in ascending order Then, by Cholesterol in Ascending Order. And finally, by WBC in Descending order due to the keyword 'descending' placed before WBC. Sort applies to variables in the order listed under BY variable. If you study the rows with identical data points, you will understand. Second example:
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