Last edited on 20.Jan.97 by gs

Workshop on
Design and Implementation of
Data Analysis Systems
Materials Available, and Summary. European AM, Saturday 25 March.

Our apologies for the slightly disorganised nature of these notes. There is a lot of information here, and links to other material, but it is not well organised. That is one of the things that might happen when one tries to gather material and publish it in real time

The opening session on Thursday evening was a presentation by Piet Groeneboom (TU Delft) (P.Groeneboom@twi.tudelft.nl) and his colleague Dimitri Tischenko

  • We have the materials for Alan Wilk's presentation on The future of S .

  • Robert Gentleman and Ross Ihaka gave a presentation about R. R (an alternative to S) written by Ross Ihaka and Robert Gentleman of the University of Aukland. R is implemented via an underlying Scheme interpreter that is itself written in C. One of the reasons to implement R is to have an S-like environment that can work on small Macintoshes. The current version is used for teaching introductory courses on Macs with less than 4mb of memory.

    Ihaka and Gentleman's R software is available at the University of Aukland via FTP

    Interesting discussion about the implementation, and particular the modes of evaluation (lazy vs. eager) of S and R, with particular comments by Luke Tierney.

  • M Theus of Augsburg started with a brief basic introduction to DataDesk, showing graphics capabilities and drag and drop, including things like dragging one plot into another to ensure that the two plots are the same size (and the same scale).

  • Luke Tierney gave a presentation about XLispStat. Luke started with a simple explanation of (X)LispStat, including some of the modelling tools that are available. Graphics is the strength of the system, particularly dynamic graphics (like spinning point clouds) and linking of graphs for data exploration. He showed a kernel density estimate with a scroll bar to modify the smoothing parameter. An interesting example was a kernel density estimate that was done by continually updated by bootstrapping from the data and redrawing the display on the fly. Many of the "simple" extensions that Luke described were extremely powerful. A theme of the presentation was that the system provides tools that allow anyone to extend the graphics and particular commands. There was some discussion about Luke's Grand Tour implementations, which just reinforced his point that the open nature of the system allowed users to try different versions of many plots, including the Grand Tour.

    Where is the package going.

    The software is available from the StatLib server and from Luke's FTP server

  • Frank Weitek gave a talk about a graphic editor for epidemiological models

  • Bill Cleveland and Rick Becker gave a tag-team presentation on Trellis Displays.

  • Allan Wilks gave an interesting presentation on Pictor, the next generation of graphics for S. Simple notes on this talk are MANET talk and information about Radical Effective Graphical Analysis of Regional Data are available

  • D. Keim (München) will talk on Visualisation and data mining (Note: big files, w. colour.)

  • Rick Becker and Allan Wilks presented some material on maps (in S). The Technical Report is available on netlib. It is a compressed postscript file.

  • Our faithful conference organiser, Günther Sawitzki (StatLab Heidelberg) will speak on On a Voyage to Oberon, Part II