Chapter 40: The GRADAR Procedure

Overview

The GRADAR procedure creates radar (or star) charts that show the relative frequency of data measures in quality control or market research problems. On a radar chart, the chart statistics are displayed along spokes that radiate from the center of the chart (hence the term star charts). The charts are often stacked on top of one another with reference circles, thus giving them the look of a radar screen. By default, the chart vertices ”the points where the statistical values intersect the spokes ”are based on the frequencies associated with the levels of a single numeric variable, but they can be scored with a weight variable. Non-integer values of the chart variable are truncated to integers. The measures can be displayed in decreasing order, the order in which they appear in the input data, increasing order of internal values, or lexicographic order of variable names .

Note: The Java applet does not support client-side rendering of GRADAR charts.