Archive for April 2005

statistical graphics 101: Barcharts

This month’s graphics is the Barchart. The barchart is used to visualize categorical data. It is often confused with the histogram, which can only be used if the data is continuous. The following barchart shows the distribution of all passengers of the Titanic according to their classes. All passengers who survived are highlighted in red. […]

The Good & the Bad [4/2005]

Two examples of plotting geographical information. The first ”The Bad” is from ”Informationen zur politischen Bildung, No. 285″ (Information for political education) and gives a very good example how badly human perception works for judging the area of a circle The second “The Good” is from the 19th century and shows a map of several […]