Graphs Graphs capture much more detail than numerical summaries so very useful for learning about data and communicating its features At the same time graphical interpretation isnt standard in the way that numerical summaries are and our eyes can fool us ID: 574627
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Slide1
Graphs and Plots in RSlide2
Graphs
Graphs
capture much more detail than numerical summaries, so very useful for learning about data and communicating its features.At the same time, graphical interpretation isn’t standard in the way that numerical summaries are, and our eyes can fool us.Slide3
Some General Rules
Insights from Edward
Tufte
(2001)show the dataInduce the reader to think about the data being presentedAvoid distorting the data
http://www.npr.org/2011/07/03/137536111/by-the-numbers-todays-militarySlide4
More Insights from Tufte
Present many numbers with minimum ink
Try to make
large data sets coherentEncourage the reader to compare different pieces of data“Reveal” Data at different levels of detailThe visualization should serve a reasonably clear purpose
http://xkcd.com/1064/Slide5
Things to Avoid Whenever Possible:
Avoid distractions, chart junk, and distorting data.
Phillips (
1991)Slide6
Why Pie Charts are Usually Terrible.
http://xkcd.com/688/Slide7
Pie Charts in the Wild
http://www.engadget.com/2008/01/15/live-from-macworld-2008-steve-jobs-keynote/
http://www.jgc.org/blog/uploaded_images/FeaturesByVersion-777059.pngSlide8
Why Pie Charts are Usually Terrible.
(
Source: Wikipedia user
Schutz
)