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Journal of Quality Technology
A Quarterly Journal of Methods, Applications and Related Topics
Volume 29, 1997 - Issue 2
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Articles

X̄ Chart with Variable Sample Size and Sampling Intervals

Antonio F. B. CostaUniversidade Estadual Paulista, 12500-000Guaratinguetá, S. P.BrazilView further author information
Pages 197-204 | Published online: 21 Feb 2018
 
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Abstract

Recent theoretical studies have shown that the X̄ chart with variable sampling intervals (VSI) and the X̄ chart with variable sample size (VSS) are quicker than the traditional X̄ chart in detecting shifts in the process. This article considers the X̄ chart with variable sample size and sampling intervals (VSSI). It is assumed that the amount of time the process remains in control has exponential distribution. The properties of the VSSI X̄ chart are obtained using Markov chains. The VSSI X̄ chart is even quicker than the VSI or VSS X̄ charts in detecting moderate shifts in the process.

Additional information

Notes on contributors

Antonio F. B. Costa

Dr. Costa is an Assistant Professor in the Department of Production at the Campus De Guarantinguetá. He is a Member of ASQC.

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