Fall 2007 Thursday, September 27   Heike Hofmann Department of Statistics Iowa State University "Scagnostics for Projection Pursuit" 3:00 Refreshments in 241 Schaeffer Hall 3:30 Talk in 140 Schaeffer Hall Finding "interesting" projections in high dimensional space has a long tradition, yielding in methodological solutions such as the grand tour (Asimov 1958) or projection pursuit methods. While the grand tour walks through the high-dimensional space on a path that covers all possible lower dimensional projections, this path is optimized in projection pursuit methods for one specific optimality index. We propose an application of graph-theoretic indices as optimization criterion in projection pursuit: instead of a single criterion, a combination of these indices allows us to look for projections that are e.g. 80% "skinny", 15% "clumpy" with 0% outliers, etc. By allowing to change the index setting interactively, the analyst can guide the projection pursuit in more ways than the usual parameters allow.

All talks are free and open to the public. To receive colloquium reminders via email, please send a request to statistics@uiowa.edu. The 37th Annual Craig Lectures will be on October 11 and 12. Our speaker this year is Nancy Reid from the University of Toronto. Past colloquia: Spring 2007 | Fall 2006 | Spring 2006 | Fall 2005 | Spring 2005 | Fall 2004 | Spring 2004 | Fall 2003 | Spring 2003 | Fall 2002 | Spring 2002 | Fall 2001 | Spring 2001 | Fall 2000 | Spring 2000 | Fall 1999 | Spring 1999 | Fall 1998 | Spring 1998

Copyright c. 2007 The University of Iowa. All Rights Reserved. Photography c. UI Photo Service and University Relations, University of Iowa This page was last modified on Tuesday, 30-Oct-2007 11:03:59 CDT. /ts