Phase II monitoring of multivariate simple linear profiles

Authors:
R. Noorossana;M. Eyvazian;A. Vaghefi
Affiliations:
Department of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran;Department of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran;Department of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran
Venue:
Computers and Industrial Engineering
Year:
2010

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Abstract

In some quality control applications, quality of a product or process can be characterized by a relationship between two or more variables that is typically referred to as profile. Moreover, in some situations, there are several correlated quality characteristics, which can be modeled as a set of linear functions of one explanatory variable. We refer to this as multivariate simple linear profiles structure. In this paper, we propose the use of three control chart schemes for Phase II monitoring of multivariate simple linear profiles. The statistical performance of the proposed methods is evaluated in term of average run length criterion and reveals that the control chart schemes are effective in detecting shifts in the process parameters. In addition, the applicability of the proposed methods is illustrated using a real case of calibration application.