On September 22, 1759, Scottish engineer and political economist William Playfair was born. He is generally considered the founder of graphical methods of statistics. William Playfair invented four types of diagrams: line graph, bar chart, pie chart, and circle graph. William Playfair Playfair was born in 1759 in Scotland during the Enlightenment, a Golden Age in the arts, sciences, industry and commerce. He was the fourth son of the reverend James Playfair…Read more
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