Most people know Florence Nightingale as a nurse extraordinaire as well as an accomplished writer and educator.
What many people may not know is that this English nurse was quite a statistician. She is generally credited with inventing an early form of the modern pie chart known as the polar area diagram, sometimes called the “Nightingale Rose” or “Nightingale Coxcomb” diagram.

The original coxcomb graph illustrated by Florence Nightingale. Click on the graph to see a recently redrawn version.
Nightingale returned from Turkey and the Crimean War in 1856, upset at the number of avoidable deaths that had occurred in the field hospital she had managed. She was determined to convince Queen Victoria that reform was needed in the British military health service and she planned to use statistics to do it.
With the help of epidemiologist William Farr, she created a report that was unusual for the time because she intended to persuade using charts and graphs. She used her diagram to demonstrate to the Queen the numbers of deaths by month by cause – three variables (no small task for a pie chart of any era).
The Queen was apparently impressed as she called for an official inquiry and changes were implemented to improve the sanitary and health care practices of the military health service.
Nightingale’s charts were not without detractors (as are modern pie charts – some people hate them). A stacked bar graph may have illustrated her point more dramatically and one of the criticisms of her rose chart is that deaths would be better represented as proportional to area not by radius as Ms. Nightingale chose to use in an early version (she later corrected this).
Besides Queen Victoria, her charts apparently made an impression at The Economist. Florence Nightingale’s chart is included in a group of three graphics the publication considers among history’s best – no small feat for a woman also busy being the mother of modern nursing.
There were about 5,500 registered nurses in Alaska in 2008, and almost all of them owe credit to Florence Nightingale for advancements in their field. To read more about nursing and Alaska’s health care industry, check out the March 2010 issue of Alaska Economic Trends.