Monitoring the coefficient of variation using a variable sample size and sampling interval control chart. Issue 7 (9th August 2017)

• Record Type: Journal Article
• Authors: Khaw, Khai Wah; Khoo, Michael B. C.; Yeong, Wai Chung; Wu, Zhang
• Is Part Of: Communications in statistics. Volume 46:Issue 7(2017)
• Page Start: 5772
• Page End: 5794
• Publication Date: 2017-08-09
• Subjects: Average time to signal -- Coefficient of variation -- Expected average time to signal -- Markov chain -- Variable sample size and sampling interval; Primary 90B25 -- Secondary 62P30; Mathematical statistics -- Periodicals; Mathematical statistics -- Data processing -- Periodicals; Digital computer simulation -- Periodicals; 519.5
• DOI: 10.1080/03610918.2016.1177074
• Languages: English
• ISSNs: 0361-0918

Abstract

ABSTRACT: This article proposes a CV chart by using the variable sample size and sampling interval (VSSI) feature to improve the performance of the basic CV chart, for detecting small and moderate shifts in the CV. The proposed VSSI CV chart is designed by allowing the sample size and the sampling interval to vary. The VSSI CV chart's statistical performance is measured by using the average time to signal (ATS) and expected average time to signal (EATS) criteria and is compared with that of existing CV charts. The Markov chain approach is employed in the design of the chart.