image
FIGURE 3-1
Graphs That Persuade
This coxcomb graph, based on Florence Nightingale’s original coxcomb graph, “Diagram of the Causes of Mortality in the Army in the East,” addresses the period from April 1854 to March 1855. It is called a coxcomb graph because the data arrangement resembles the shape of a rooster’s head. The 12 sections represent the ordinal variable of a year broken into 12 months. The size of the sections representing each month indicates the scale variable of how many people died in that particular month. The colors represent the nominal variable of cause of death.