Article ID: | iaor20171006 |
Volume: | 33 |
Issue: | 3 |
Start Page Number: | 637 |
End Page Number: | 656 |
Publication Date: | Apr 2017 |
Journal: | Quality and Reliability Engineering International |
Authors: | Saghir Aamir, Chakraborti Subhabrata, Ahmad Ishfaq |
Keywords: | control, statistics: distributions |
A phase‐I study is generally used when population parameters are unknown. The performance of any phase‐II chart depends on the preciseness of the control limits obtained from the phase‐I analysis. The performance of phase‐I bivariate dispersion charts has mainly been investigated for bivariate normal distribution. However, this assumption is seldom fulfilled in reality. The current work develops and studies the performance of phase‐I |S| and |G| charts for monitoring the process dispersion of bivariate non‐normal distributions. The necessary control charting constants are determined for the bivariate non‐normal distributions at nominal false alarm probability (FAP