Some new methods for comparing the capability of two processes using process capability index C pm
International Journal of Quality & Reliability Management
ISSN: 0265-671X
Article publication date: 24 June 2021
Issue publication date: 30 March 2022
Abstract
Purpose
The purpose of the paper is the construction of confidence intervals for the ratio of the values of process capability index Cpm for two processes. These confidence intervals can be used for comparing the capability of any pair of competitive processes.
Design/methodology/approach
Two methods for constructing confidence intervals for the ratio of the values of process capability index Cpm for two processes are proposed. The suggested techniques are based on a two-step approximation of the doubly non-central F distribution. Their performance is tested via simulation.
Findings
The performance of the suggested techniques seems to be rather satisfactory even for small samples, as illustrated through the use of simulated data.
Practical implications
The practical implication of the suggested techniques is that they can be implemented in real-world applications, since they can be used for comparing the capability of any pair of competitive processes.
Originality/value
The paper presents two new methods for constructing confidence intervals for the ratio of the values of process capability index Cpm for two processes.
Keywords
Citation
Perakis, M. (2022), "Some new methods for comparing the capability of two processes using process capability index
Publisher
:Emerald Publishing Limited
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