Citation

Lim, S. L and Yeong, Wai Chung and Khoo, Michael B. C. and Mataka, N.R and Ng, P.S (2025) A Variable Sampling Interval Side-sensitive Synthetic Coefficient of Variation Chart. ASM Science Journal, 20 (2). p. 12. ISSN 1823-6782

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Abstract

The side-sensitive synthetic chart has been shown to effectively detect changes in the coefficient of variation (γ ), though its reliance on fixed sampling intervals may reduce its efficiency when compared to adaptive strategies. This paper aims to improve the chart by incorporating the variable sampling interval (VSI) feature that varies the sampling interval based on the performance of the plotting statistic of the previous sample. Formulae for the average and standard deviation of the time to signal (ATS and SDTS) of the proposed chart are derived, and procedures that optimise the chart’s performance are given. Numerical comparisons reveal that the VSI feature enhances the performance of the side-sensitive synthetic γ chart by resulting in smaller out-of-control ATS values. Furthermore, an actual example is given to illustrate the effectiveness of the proposed chart in detecting out-of-control conditions in practical settings. © 2025 Akademi Sains Malaysia. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Average time to signal coefficient of variation, side-sensitive, synthetic chart, variable sampling interval
Subjects:	Q Science > QA Mathematics > QA101-(145) Elementary mathematics. Arithmetic
Divisions:	Faculty of Business and Law (FBL) Faculty of Computing and Informatics (FCI)
Depositing User:	Nor Afiqah Mohd Adnan
Date Deposited:	06 Nov 2025 03:05
Last Modified:	06 Nov 2025 14:19
URII:	http://shdl.mmu.edu.my/id/eprint/14703

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