Control charts for process dispersion parameter under contaminated normal environments

Amjid Ali; Tahir Mahmood; Hafiz Zafar Nazir; Iram Sana; Noureen Akhtar; Sadia Qamar; Muhammad Iqbal

doi:10.1002/qre.1950

Control charts for process dispersion parameter under contaminated normal environments

Amjid Ali^*, Tahir Mahmood, Hafiz Zafar Nazir, Iram Sana, Noureen Akhtar, Sadia Qamar, Muhammad Iqbal

^*Corresponding author for this work

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

Abstract

Control charts are important statistical tool used to monitor fluctuations in the process location and dispersion parameters. The issues relating to the appropriate choice of control charts for the effective detection of process variability are addressed, and different control chart structures, such as Shewhart-type, exponentially weighted moving average and cumulative sum are explored under ideal assumption of normality and contaminated normal environments, and hence, those control charts structures are identified which are more capable to detect aberrant changes in the process dispersion.

Original language	English
Pages (from-to)	2481-2490
Number of pages	10
Journal	Quality and Reliability Engineering International
Volume	32
Issue number	7
Early online date	20 Oct 2016
DOIs	https://doi.org/10.1002/qre.1950
Publication status	Published - Nov 2016
Externally published	Yes

Keywords

contamination
dispersion
influence function
normality
power curves
robustness
statistical process control
standardized variance

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10.1002/qre.1950

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title = "Control charts for process dispersion parameter under contaminated normal environments",

abstract = "Control charts are important statistical tool used to monitor fluctuations in the process location and dispersion parameters. The issues relating to the appropriate choice of control charts for the effective detection of process variability are addressed, and different control chart structures, such as Shewhart-type, exponentially weighted moving average and cumulative sum are explored under ideal assumption of normality and contaminated normal environments, and hence, those control charts structures are identified which are more capable to detect aberrant changes in the process dispersion.",

keywords = "contamination, dispersion, influence function, normality, power curves, robustness, statistical process control, standardized variance",

author = "Amjid Ali and Tahir Mahmood and Nazir, {Hafiz Zafar} and Iram Sana and Noureen Akhtar and Sadia Qamar and Muhammad Iqbal",

year = "2016",

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doi = "10.1002/qre.1950",

language = "English",

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pages = "2481--2490",

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T1 - Control charts for process dispersion parameter under contaminated normal environments

AU - Ali, Amjid

AU - Mahmood, Tahir

AU - Nazir, Hafiz Zafar

AU - Sana, Iram

AU - Akhtar, Noureen

AU - Qamar, Sadia

AU - Iqbal, Muhammad

PY - 2016/11

Y1 - 2016/11

N2 - Control charts are important statistical tool used to monitor fluctuations in the process location and dispersion parameters. The issues relating to the appropriate choice of control charts for the effective detection of process variability are addressed, and different control chart structures, such as Shewhart-type, exponentially weighted moving average and cumulative sum are explored under ideal assumption of normality and contaminated normal environments, and hence, those control charts structures are identified which are more capable to detect aberrant changes in the process dispersion.

AB - Control charts are important statistical tool used to monitor fluctuations in the process location and dispersion parameters. The issues relating to the appropriate choice of control charts for the effective detection of process variability are addressed, and different control chart structures, such as Shewhart-type, exponentially weighted moving average and cumulative sum are explored under ideal assumption of normality and contaminated normal environments, and hence, those control charts structures are identified which are more capable to detect aberrant changes in the process dispersion.

KW - contamination

KW - dispersion

KW - influence function

KW - normality

KW - power curves

KW - robustness

KW - statistical process control

KW - standardized variance

UR - https://scholars.cityu.edu.hk/en/publications/control-charts-for-process-dispersion-parameter-under-contaminated-normal-environments(d80d7889-0b69-4651-a5c7-6207089433e8).html

U2 - 10.1002/qre.1950

DO - 10.1002/qre.1950

M3 - Article

VL - 32

SP - 2481

EP - 2490

JO - Quality and Reliability Engineering International

JF - Quality and Reliability Engineering International

IS - 7

ER -

Control charts for process dispersion parameter under contaminated normal environments

Abstract

Keywords

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