Title:  Conditional Maps of Continuous Variables

Abstract:

	Chloropleth maps offer a simple approach to the
	display of cross-correlation of two variables.
	Variable levels are cross-tabulated in a 2x2
	or 3x3 matrix, and a color or cross-hatched
	plotted in regions of the map.  We believe a
	continuous shading or coloration coupled with
	continuous conditioning offer advantages to
	understanding the spatial distribution of not
	only individual variables, but also their
	cross-correlation.  We describe the algorithm,
	which is based upon multivariate kernel regression,
	and its implementation in ArcView.  Examples
	from NCI databases will be displayed.