Abstract

Hotelling's T2 is customarily used as the control chart for multivariate SPC analysis. This chart responds to changes in both the mean values and the covariance matrix of the responses. In this article, we propose the use of a chart that concentrates on changes in the covariance matrix. The use of this covariance chart in concert with the T2 chart enables the user to better determine whether T2 points out of control are due to changes in mean values or due to changes in the covariance matrix. Using this chart in conjunction with T2 thus furnishes a suite of tools similar to the x-bar and standard deviation charts for univariate processes.

Publication Date

2002

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type

Article

Department, Program, or Center

Accounting (SCB)

Campus

RIT – Main Campus

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