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Gary Klass Department of Politics and Government Illinois State University

Gary Klass Department of Politics and Government Illinois State University. Data Presentation Standards “Graphical Excellence” -- Edward Tufte. well-designed presentation of data of substance, statistics and design complex ideas communicated with clarity, precision and efficiency

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Gary Klass Department of Politics and Government Illinois State University

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  1. Gary Klass Department of Politics and Government Illinois State University

  2. Data Presentation Standards“Graphical Excellence” -- Edward Tufte • well-designed presentation of data of substance, statistics and design • complex ideas communicated with clarity, precision and efficiency • the greatest number of ideas in the shortest time with the least ink in the smallest space.Best example: Baseball statistics

  3. Florence Nightengale

  4. Nurses arrive in November ‘54 Sanitary commissionarrives in March ‘55

  5. Data Presentation Principles • Show the data • Minimize the ink to data ratio • Present many numbers in a small space • Sort by a meaningful variable • Tell the Truth -- Avoid data distortion • Tables and charts should be self-explanatory • Highlight Meaningful comparisons

  6. Minimize the ink to data ratio • Avoid using unnecessary legends (and color coding) • Minimize gridlines (or vertical axis lines) • Never use 3-D

  7. Sort the Data! • By the most meaningful variable • The Alphabet is not the most meaningful variable • Time goes left to right

  8. Sort Data by the most important variable The Alphabet is not the most important variable

  9. Revised chart

  10. Stacked bar: Upside down?

  11. Revised:Officers Assaulted in Florida, 1991-2008

  12. Time goes left to right

  13. Tell the Truth! • Avoid Data Distortion

  14. Scaling distortion

  15. New York State Criminal Justice, 2008 Crimestat Report

  16. Note also: Top charts uses 12 numbers to represent 5 datapoints

  17. Minimize the ink-to-data ratio • Avoid all ChartJunk • Never use 3-D • Eliminate unnecessary lines

  18. ChartJunk: Junked Car

  19. Don’t use Pie Charts!!!!!!! • Never use Pie Charts • Never ever use 3-D Pie Charts • Never compare data across two pie charts • Beware of the Pie Chart’s friends: pyramids, cones, donuts and radars

  20. Bar charts are better

  21. Two pie charts are worse than one

  22. Revised Chart:Parolee Employment Status, 2007-8

  23. Maybe a Pie: If only one slice matters Labels on slices,No legend

  24. Data-to-ink ratio Simple Graphics Boxplots, Sparklines, and Dot - Plots the greatest number of ideas in the shortest time with the least ink in the smallest space.

  25. Cancer survival rates in the US and 20 European nations

  26. Sparklines: "intense, simple, word size graphics” - Tufte

  27. Sparkline bars

  28. jjj

  29. Win\Loss sparkline

  30. Dashboards See:Stephen FewInformation Dashboard Design: The Effective Visual Communication of Data A dashboard is a visual display of the most important information needed to achieve one or more objectives; consolidated and arranged on a single screen so the information can be monitored at a glance.

  31. Dashboards • http://executivedashboards.org/2010/10/05/good-executive-dashboards/

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