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Projection pursuit describes a procedure for searching high dimensional data for \inter-esting" low dimensional projections, via the optimization of a criterion function called the projection pursuit index. By empirically examining the optimization process for several projection pursuit indices we observed dierences in the types of structure that maximized(More)
GGobi is a direct descendent of a data visualization system called XGobi that has been around since the early 1990's. GGobi's new features include multiple plotting windows, a color lookup table manager, and an XML (Extensible Markup Language) file format for data. Perhaps the biggest advance is that GGobi can be easily extended , either by being embedded(More)
This paper describes a link between a Geographical Information System GIS, ARCCINFO TM , and an interactive dynamic graphics program, XGobi. GISs provide a user with a standard and convenient software for spatial geographical data. In particular, the GIS ARCCINFO i s a combination of two systems: ARC maintains the spatial information of map features and(More)
In high-dimensional data, one often seeks a few interesting low-dimensional projections which reveal important aspects of the data. Projection pursuit is a procedure for searching high-dimensional data for interesting low-dimensional projections via the optimization of a criterion function called the projection pursuit index. Very few projection pursuit(More)
In Symanzik et al. 1995 and Majure et al. 1995 we h a ve presented a bidirectional link between a Geographic Information System GIS, ArcView, and an interactive dynamic graphics program, XGobi. Since then, the link has been extended to support additional methods of spatial statistics such a s v ariogram cloud plots and spatially lagged scatterplots. While(More)
This paper reports on research into interactive, dynamic statistical graphics (DSG) applied to spatial data maintained within a geographic information system (GIS). We developed a bidirectionai link between ArcView 2.1 TM, a GIS, and XGobi, a DSG program. Multivariate data, collected at geographic locations, is passed from ArcView to XGobi and can be(More)
We have created an immersive application for statistical graphics and have investigated what benefits it offers over more traditional data analysis tools. This paper presents a description of both the traditional data analysis tools and our virtual environment, and results of an experiment designed to determine if an immersive environment based on the XGobi(More)
How do we know if what we see is really there? When visualizing data, how do we avoid falling into the trap of apophenia where we see patterns in random noise? Traditionally, infovis has been concerned with discovering new relationships, and statistics with preventing spurious relationships from being reported. We pull these opposing poles closer with two(More)