purple america: using color and other visual cues to convey information · 2008. 3. 26. · c 2004...
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Purple America:
Using Color and Other Visual Cues to Convey
Information
Robert J. Vanderbei
December 7, 2007
Politics Department Lunchtime SeminarPrinceton University
http://www.princeton.edu/∼rvdb
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1. USA Today
2. ElectionMaps
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3. PurpleAmerica
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4. Color Perception
Physically, color is infinite dimensional—it can be described by a function I(λ).
But, the human eye has only three types of color receptors. They are locatedin the cones. Hence, human color perception is 3 dimensional.
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Primary Colors
Computer monitors use Red, Green, and Blue as primary colors:
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6. Red, White, and Blue America
Margin of Victory
Very patriotic!
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7. Brighter America 2004
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8. Brighter America 1992
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9. Colors Reversed
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10. Where People Live
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12. Red-Blue Cartogram
c©2004 M.T. Gastner, C.R. Shalizi, M.E.J. Newman
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13. Purple Cartogram
c©2004 M.T. Gastner, C.R. Shalizi, M.E.J. Newman
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14. 2006 Congressional Election
County-by-County
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15. 2006 Congressional Election
District-by-District
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16. 2006 Congressional Election: Margin-Of-Victory
District-by-District
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17. Statistical Analysis of Polling Data