Archive

Archive for August, 2009

Good Graphs: Graphical Perception and Data Visualization

August 28th, 2009 7 comments

What makes a good graph? When faced with a slew of numeric data, graphical visualization can be a more efficient way of getting a feel for the data than going through the rows of a spreadsheet. But do we know if we are getting an accurate or useful picture? How do we pick an effective visualization that neither obscures important details, or drowns us in confusing clutter? In 1968, William Cleveland published a text called The Elements of Graphing Data, inspired by Strunk and White’s classic writing handbook The Elements of Style . The Elements of Graphing Data puts forward Cleveland’s philosophy about how to produce good, clear graphs — not only for presenting one’s experimental results to peers, but also for the purposes of data analysis and exploration. Cleveland’s approach is based on a theory of graphical perception: how well the human perceptual system accomplishes certain tasks involved in reading a graph. For a given data analysis task, the goal is to align the information being presented with the perceptual tasks the viewer accomplishes the best. Read more…

A Demonstration of Data Mining

August 19th, 2009 2 comments

REPOST (now in HTML in addition to the original PDF).

This paper demonstrates and explains some of the basic techniques used in data mining. It also serves as an example of some of the kinds of analyses and projects Win Vector LLC engages in. Read more…

On The Hysteria Over “The Cloud”

August 13th, 2009 3 comments

On The Hysteria Over “The Cloud”


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The frenzy of anticipation and opinion about “The Cloud” is so intense and so pointless it becomes “parody proof.”
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