Frequency distributions (univariate and joint) can be displayed in contingency tables, or cross-tabulations. In this video we show how tapply() can be used to create such tables, but we…
The tapply() function is one of several "apply" functions in R that allow a function to operate on data repeatedly. The function tapply() applies a function to groups of observations within…
In this video we review the anatomy of a boxplot and show how to use PROC SGPLOT to produce vertical or horizontal boxplots. We show how to produce side-by-side boxplots as well as clustered…
PROC SGPLOT implements a wide variety of different plot types. In this video, we introduce the procedure and illustrate how to use it to produce bar charts that display frequency distributions or…