Yale University
Department of Statistics

Monday, January 22, 1995
Professor Leland Wilkinson
SPSS Inc. &
Department of Statistics, NorthWestern University

Seminar to be held in Room 107, 24 Hillhouse at 4:15 pm

Statistical and technical graphs can be viewed as collections of graphical elements organized by a set of rules. These elements consist of data-based objects such as clouds, smoothers, and partitions, as well as annotation and text. A relatively powerful set of rules can be derived from a simple algebra embedded in a context. The algebra is similar to ones used for specifying tables. The context involves dimensionality, coordinate systems, and other aspects related to the display area. Two systems will be used to demonstrate some of these ideas in software: An alpha version of SYSTAT 6 for Windows, and a Smalltalk prototype of a graphical system under development for SPSS Version 8.