A note on “Monitoring the ratio of two normal variables using variable sampling interval exponentially weighted moving average control charts”

Saralees Nadarajah; Idika Okorie

doi:10.1002/qre.2649

A note on “Monitoring the ratio of two normal variables using variable sampling interval exponentially weighted moving average control charts”

Saralees Nadarajah
, Idika Okorie

Mathematics

University of Manchester

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Considered monitoring of the ratio of two correlated normal random variables based on an approximation. In this note, we derive a closed form expression for the ratio of two correlated normal random variables. We point out that the approximation used in Nguyen et al. does not always perform well.

Original language	British English
Pages (from-to)	1849-1854
Number of pages	6
Journal	Quality and Reliability Engineering International
Volume	36
Issue number	6
DOIs	https://doi.org/10.1002/qre.2649
State	Published - 1 Oct 2020

Keywords

error function
normal distribution
ratio

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abstract = "Considered monitoring of the ratio of two correlated normal random variables based on an approximation. In this note, we derive a closed form expression for the ratio of two correlated normal random variables. We point out that the approximation used in Nguyen et al. does not always perform well.",

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A note on “Monitoring the ratio of two normal variables using variable sampling interval exponentially weighted moving average control charts”

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Keywords

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