Approval Criteria for Multivariate Measurement Systems

Journal of Quality Technology vol. 40 issue 2 - April 2008

Abstract: [This abstract is based on the author’s abstract.] Standard measurement-system analysis criteria assume a measuring device measures a single product characteristic to determine functionality. In automotive-body manufacturing, however, data are taken for many quality characteristics and each response is evaluated independently. This study develops multivariate extensions of gauge-approval criteria precision to tolerance ratio, percent repeatability and reproducibility (R&R), and signal to noise ratio. These criteria use the volume of constant-density contours to characterize variability. A MANOVA method is used to estimate the variance-covariance matrices for one-factor, two-factor, and three-factor gauge studies. It is shown how to fit the MANOVA model and estimate the multivariate criteria using automotive body panel gauge-study data.

Keywords: Gage Repeatability and reproducibility studies (GR&R) - Analysis of variance (ANOVA) - Measurement system - Multivariate capability indices - Signal-to-noise ratio - Automotive

Access this article
Other ways to access this article
You will need Adobe Reader to view this PDF document. Download the free Reader from Adobe

Featured advertisers


(0) Member Reviews

Featured advertisers

ASQ is a global community of people passionate about quality, who use the tools, their ideas and expertise to make our world work better. ASQ: The Global Voice of Quality.