Playfair's commercial and political atlas and statistical breviary
A scientific revolution began at the end of the 18th century with the creation and popularization of the graphic display of data by Scottish inventor William Playfair, who introduced the line graph, bar chart, and pie chart into statistics. His remarkable Atlas demonstrated how much could be learned if one plotted data graphically and looked for suggestive patterns to provide evidence for pursuing research. In the Statistical Breviary, Playfair invented the pie chart and expanded upon this concept to facilitate the comparison of the resources of European countries.
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