Displaying Multivariate Data Using Polyplots

Article

Blazek, Linda W.; Novic, Bradley; Scott, Douglas M.   (1987, ASQC)   Alcoa Laboratories

Journal of Quality Technology    Vol. 19    No. 2
QICID: 5575    April 1987    pp. 69-74
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Article Abstract

Polyplots are glyphs which display multivariate and univariate data simultaneously over time. Each glyph, a regular polygon with as many vertices as the number of variables of interest, represents one time interval. By locating the mean at the vertex and using rays fro the vertex to indicate magnitude and direction, the polyplot becomes a univariate control chart for every variable. Changing the color or line style of the rays signifies whether the 2-sigma and 3-sigma limits are exceeded univariately. A "thermometer" graphic to the left of each glyph displaying the Hotelling T2 value provides multivariate control chart information.

Keywords

Multivariate control charts,Process control,Graphical methods,Hotelling's T2 statistic


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