It was in 1801, by William Playfair, who also invented the bar chart and line graphs of economic data.
Check out “Milestones in the History of Thematic Cartography, Statistical Graphics, and Data Visualization,” an awesomely cross-referenced website by Michael Friendly and Daniel J. Denis.
I also recommend Edward Tufte's The Visual Display of Quantitative Information for historical perspective -- and gorgeous data graphics.
3 comments:
Yay! Update! --brad
Wow...this scares me. I knew you loved this stuff, but really, who asks these questions?
Playfair is one of my ancestors. I'm glad to see him mentioned in conjunction with Prospect Research. :)
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