Process capability index C pm under autoregressive process AR (2)
International Journal of Quality & Reliability Management
ISSN: 0265-671X
Article publication date: 24 November 2023
Issue publication date: 14 March 2024
Abstract
Purpose
The paper aims to identify the effect of ignorance of correlatedness among process observations and to implement new sampling schemes; skip and mixed sampling, in order to reduce the effect of autocorrelation on process capability index (PCI)
Design/methodology/approach
Autocorrelated observations are generated using autoregressive process of order two (AR (2)) using Monte Carlo simulations. The PCI is computed based on these observations assuming the independence. The skip and mixed sampling schemes are then used to form sub-groups among correlated observations. The PCI obtained using sub-groups from skip and mixed sampling schemes are assessed using sample mean and sample standard deviation.
Findings
The paper provides empirical insights into how the effect of autocorrelation decreases in the estimated value of PCI
Originality/value
This paper fulfills an identified need to study how to reduce the effect of autocorrelation on PCI
Keywords
Acknowledgements
The authors would like to thank the editor and referees for their comments that helped to improve an earlier version of the paper.
Citation
Ghute, V. and Deshpande, M. (2024), "Process capability index
Publisher
:Emerald Publishing Limited
Copyright © 2023, Emerald Publishing Limited