StATS: Three dimensional bar and pie charts (February 21, 2006)
I often get asked to review research papers and posters that people here at
the hospital produce, and I am always glad to do so. Sometimes these papers
and posters have me listed as a co-author, so I have even more incentive to
do a careful review.
Once in a while, a paper or poster will have a graphical presentation of
data that includes a bar chart or pie chart that includes a fake three
dimensional dimension that exists solely to make the data look more
impressive. This is something I always discourage. The three dimensional
effect almost always makes it more difficult to read numbers off of the chart
and to make comparisons. A two dimensional chart works much better.
I did have a stock talk that I gave on this topic, but it has been lost to
time and I need to find a way to resuscitate it. Several sections of this
venerable talk have been repackaged into the following web pages:
but more work needs to be done.
A very nice beginners guide on how to layout tables and graphs properly is
- Presenting Numbers, Tables, and Charts. Sally Bigwood, Melissa
Spore (2003) Oxford, England: Oxford University Press.
link] (Model, Descriptive, Graphics)
These authors also have a nice website:
- Plain Figures.
Sally Bigwood, Melissa Spore. Accessed on 2005-04-15. (Model >> Graphics)
[Excerpt] Plain Figures is a method of transforming numerical information
into figures, tables and graphs that people readily understand. Plain
Figures is an international consulting and training company that can make
your statistical, financial and other data accurate, vivid and memorable.
Our goal is to raise the standard of data presentation throughout the world
- starting with you! Plain Figures is the subject of our book - Presenting
Numbers, Tables, and Graphs published by Oxford University Press (2003).
This useful guide puts Plain Figures methods and references at your
In the meantime, here are some web resources that decry the use of fake
three dimensional effects.
2-D or not 2-D? (That is the question). Reynolds G, Published
January 16, 2006 at Presentation Zen, Garr Reynolds' blog on issues related
to professional presentation design. Accessed on 2006-02-21. [Excerpt] We can learn how to be better presenters by
observing the masters. I often say, for example, that we can improve our
presentations by emulating certain aspects of Steve Jobs' presentation
style. Today, though, I'd like to talk about one aspect of Steve's
presentation Tuesday that we can learn from by not emulating. And that is
the use of 3-D charts to represent 2-D data. presentationzen.blogs.com/presentationzen/2006/01/2d_or_not_2d_th.html
to Construct Bad Charts and Graphs. Klass G, Department of
Politic and Government, Illinois State University, copyright 2002. Accessed
on 2006-02-16. [Excerpt] The three
fundamental elements of bad graphical display are these: Data Ambiguity,
Data Distortion, and Data Distraction. lilt.ilstu.edu/gmklass/pos138/datadisplay/badchart.htm
10 Comandments for Figures. Head K, Sauder School of Business,
University of British Columbia. Accessed on 2006-02-16. [Excerpt] If you need to satisfy me because I'm your
prof or you think I might be a referee, then just follow the rules. If you
want more information about the rationale behind the rules, they are mainly
based on the books by Edward Tufte which are really worth reading for the
examples and interesting discussion. pacific.commerce.ubc.ca/keith/figcoms.htm
Misleading visualizations. Ingo H. Accessed on 2006-02-16. [Excerpt] The Post-Enron world with it's tough
requirements on reliable financial reports has left US accountants and CEOs
without choice. They will now have to tell us the truth and nothing but the
truth about their companies financial status. Or do they? While the art of
creative accounting may have come to an end when it comes to the actual
numbers in the the book, there are still other ways in which a financial
report could mislead it's reader into believing that everything is going
great. This paper suggests various ways to make "better than reality"
charts, while at the same time preserving correctness with the underlying
statistics. Each technique is briefly evaluated in terms of a lie factor and
whether or not it fulfils the requirement of embellishing the truth while at
the same time not getting caught. Some real world examples are also
evaluated in the same way. avoinelama.fi/~hingo/kirjoituksia/misleadingvisualizations.html
- Gallery of
Data Visualization. Friendly M, Statistical Consulting Service
and Psychology Department, York University. Accessed on 2006-02-16. [Excerpt] Like good writing, good graphical
displays of data communicate ideas with clarity, precision, and efficiency.
Like poor writing, bad graphical displays distort or obscure the data, make
it harder to understand or compare, or otherwise thwart the communicative
effect which the graph should convey. This Gallery of Data Visualization
displays some examples of the Best and Worst in statistical graphics, with
the view that the contrast may be useful, inform current practice, and
provide some pointers to current work. The term "Data Visualization" means
rather different things to people in disciplines. The emphasis here is
somewhat more on the Statistical Graphics side than on the side reflected
in, say, the comp.graphics.visualization newsgroup. Do you know of other
examples of the Best or Worst in Statistical Graphics on the Web? Let me
know through this Image submission form. The page is organized as a
collection of images, along with a few of the 1000 words each may be worth
and some links to original sources. To reduce transmission time, most of the
images are presented as thumbnails, with links to larger originals. Click on
the thumnail image or on the words "Full size". ricardo.ecn.wfu.edu/SCS/Gallery/
And here is a dissenting voice, of sorts.
Visualization for Communication: The Importance of Aesthetic Sizzle [PDF].
Brath R, Peters M, Senior R, Oculus Info Inc. Accessed on 2006-02-16.
[Excerpt] When creating a visualization for communication, the inclusion
of aesthetically appealing elements can greatly increase a design’s appeal,
intuitiveness and memorability. Used without
care, this “sizzle” can reduce the effectiveness of the visualization by
obscuring the intended message. Maintaining a focus on key design principles
and an understanding of the target audience can result in an effective
visualization for communication. This paper describes these principles and
shows their use in creating effective designs. www.oculusinfo.com/papers/VisualizationSizzleForCommunication-clrFinal.pdf
All of these sites pay homage to Edward Tufte, who has made a very
persuasive case for good statistical graphics in the books he has published:
- The Visual Display of Quantitative Information. Tufte ER (1983)
Cheshire, CT: Graphic Press. ISBN: 096139210X.
- Envisioning Information. Tufte ER (1990) Cheshire, CT: Graphics
Press. ISBN: 0961392118.
- Visual Explanations: Images and Quantities, Evidence and Narrative.
Tufte ER (1997) Cheshire, CT: Graphics Press. ISBN: 0961392126.
There's a second edition of the 1983 classic that has come out, but I don't
have it yet. Dr. Tufte is also working on a new book, Beautiful Evidence,
but I have no details about it.
It's also worthwhile to visit Dr. Tufte's web site.
- The Work of Edward
Tufte and Graphics Press. Tufte ER. Accessed on 2006-02-16.
[Excerpt] Edward Tufte has written seven books, including Visual
Explanations, Envisioning Information, The Visual Display of Quantitative
Information, and Data Analysis for Politics and Policy. He writes, designs,
and self-publishes his books on information design, which have received more
than 40 awards for content and design. He is Professor Emeritus at Yale
University, where he taught courses in statistical evidence, information
design, and interface design. His current work includes digital video,
sculpture, printmaking, and a new book Beautiful Evidence. This website
describes Edward Tufte's books, one-day course, and artwork.
Finally, Edward R. Tufte has written the definitive critique of PowerPoint
- The Cognitive Style of PowerPoint. Tufte ER (2003) Cheshire, CT:
Graphics Press. ISBN: 0961392150.
which is not relevant to this weblog entry, but I can't resist the
temptation to bash Powerpoint, and
bash it again. Still I did offer
equal time to a defender of
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