Homogeneously mixed memory charts with application in the substrate production process

Z Rasheed, H Zhang, SM Anwar… - … Problems in Engineering, 2021 - Wiley Online Library
The cumulative sum (CUSUM) and the exponentially weighted moving average (EWMA)
charts are renowned classical memory charts used to monitor small and moderate shifts in …

A new exponentially weighted moving average control chart to monitor count data with applications in healthcare and manufacturing

F Mustafa, RAK Sherwani, MA Raza - Journal of Statistical …, 2023 - Taylor & Francis
Attribute control charts are widely used to monitor count data. Many distributions are
proposed to model and monitor count data. This article has developed an exponentially …

A progressive mean control chart for dispersed count data considering tail behavior

F Mustafa, RA Khan Sherwani… - Quality Technology & …, 2024 - Taylor & Francis
Popular discrete distributions generally neglect tail behavior in the count data despite its
significance in many industrial and non-industrial processes. The generalized Conway …

Homogeneously Weighted Moving Average Control Charts: Overview, Controversies, and New Directions

JC Malela-Majika, SW Human, K Chatterjee - Mathematics, 2024 - mdpi.com
The homogeneously weighted moving average (HWMA) chart is a recent control chart that
has attracted the attention of many researchers in statistical process control (SPC). The …

On the improved generalized linear model‐based monitoring methods for Poisson distributed processes

A Iqbal, T Mahmood, HZ Nazir… - Concurrency and …, 2022 - Wiley Online Library
Control charts are widely used tool that provides quality inspectors with sensitive information
for maintaining manufacturing process productivity. Numerous model‐based techniques …

Performance of multivariate homogeneously weighted moving average chart for monitoring the process mean in the presence of measurement errors

S Yousefi, MR Maleki, A Salmasnia… - Journal of Advanced …, 2023 - World Scientific
Multivariate control charts are useful tools for monitoring the product quality in which the
process outcome is expressed by several correlated variables. The multivariate …

Economic design of residuals MEWMA control chart with variable sampling intervals and sample size

L Xue, Q Wang, C Li, L An - Communications in Statistics …, 2023 - Taylor & Francis
In order to improve the monitoring efficiency of the multivariable autocorrelation process and
reduce the cost of process control, an economic design method of residual Multivariate …

On Designing a New Control Chart Using the Generalized Conway–Maxwell–Poisson Distribution to Monitor Count Data

F Mustafa, RAK Sherwani, MA Raza, JA Darwish - Processes, 2024 - mdpi.com
Many researchers employed Poisson distribution-based control charts to monitor count data.
Nevertheless, these charts can handle count data that deviate from the Poisson assumption …

New extended distribution-free homogenously weighted monitoring schemes for monitoring abrupt shifts in the location parameter

TI Letshedi, JC Malela-Majika, SC Shongwe - Plos one, 2022 - journals.plos.org
A homogeneously weighted moving average (HWMA) monitoring scheme is a recently
proposed memory-type scheme that gained its popularity because of its simplicity and …

Phase II control charts for monitoring the depth-ratio of ball-bearings involving three normal variables

L Jin, A Mukherjee, Z Song, J Zhang - Journal of Applied Statistics, 2024 - Taylor & Francis
This paper investigates the problem of monitoring the ratio involving three variables, jointly
distributed as trivariate normal. The Shewhart-type and two exponentially weighted moving …