[Colloquium] [statseminars] Statistics Seminar Series: LELAND WILKINSON Monday May 19, 2008 at 4:00 PM

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The University of Chicago
Department of Statistics
Seminar Series

LELAND WILKINSON
Department of Computer Science
University of Illinois at Chicago

Scagnostics

MONDAY, May 19, 2008 at 4:00 PM
133 Eckhart Hall, 5734 S. University Avenue
Refreshments following the seminar in Eckhart 110.

ABSTRACT

Scagnostics is a Tukey neologism for the term scatterplot diagnostics. 
Scagnostics are characterizations of the 2D distributions of orthogonal 
pairwise projections of a set of points in multidimensional Euclidean 
space. These characterizations include such measures as density, shape, 
outliers, and texture. Tukey never published the idea. Paul Tukey 
discussed it briefly at an IMA workshop on visualization in 1989.
We introduce a set of scagnostics measures based on graph theory and we 
analyze their empirical distributions and performance. Our analysis 
leads to a restrictive set of criteria that must be met in order to have 
scagnostics measures that can be used effectively in exploratory data 
analysis.

We will present several visualization applications that employ 
scagnostics. One is an interactive, exploratory framework that links 
scagnostics with scatterplots and scatterplot matrices. The other is an 
automated visualization system for displaying heterogeneous data
sources.

Please send email to Mathias Drton (drton at galton.uchicago.edu) for 
further information. Information about building
access for persons with disabilities may be obtained in advance by 
calling Jewanna Carver at 773.834-5169 or by email
(carver at galton.uchicago.edu).
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