Tips:Detecting outliers using boxplot

From sasCommunity

Boxplots or otherwise known as the Box-and-Whisker plot is a simple type of statistical chart that is used to detect outliers in data. Boxplot is a robust technique as it does not assume the underlying statistical distribution of the variable in question.

Boxplots in SAS can be generated using Proc Boxplot. Proc Boxplot

It can also be generated using Proc univariate or Gplot NESUG paper on this topic.