chapter  9
18 Pages

Box Plots

Unlike line plots and bar charts, which mainly provide data visualization for mean or median values, a box plot “summarizes the data and indicates the median, upper, and lower quartiles and minimum and maximum values” (SAS Institute Inc., 2012a). A box plot provides a quick visual summary that easily shows center, spread, range, and any outliers. This chapter introduces and illustrates the production of box plots using both GPLOT and SGPLOT procedures.