Control charts for monitoring the coefficient of variation (CV) have been receiving a lot of
attention in the literature, with numerous more powerful and robust CV charts being proposed. …

Control charting techniques have been applied to a wide variety of areas. In certain areas,
such as in finance and healthcare, the process mean and variance are not independent of …

This article is the first of its kind which proposes a Variable Parameters (VP) chart to monitor
the coefficient of variation (CV). Formulae for various performance measures and the …

This paper proposes one-sided coefficient of variation (CV) charts with a linearly covariate
error model. The one-sided CV charts are the downward and upward CV charts, which detect …

A variable sample size (VSS) scheme directly monitoring the coefficient of variation (CV),
instead of monitoring the transformed statistics, is proposed. Optimal chart parameters are …

This paper improves the sensitivity of the existing run sum chart for shifts in the coefficient of
variation γ by proposing two types of adaptive schemes, ie the variable sample size and …

Control charts for monitoring the coefficient of variation (γ) are useful for processes with an
inconsistent mean (μ) and a standard deviation (σ) which changes with μ, by monitoring the …

The side sensitive synthetic chart was proposed to improve the performance of the synthetic
chart to monitor shifts in the coefficient of variation (γ), by incorporating the side sensitivity …

A run sum chart with variable sample size (VSS) to detect shifts in the coefficient of variation
(γ) is proposed. The run sum γ chart divides the chart into different regions with distinct …

The idea of proposing the economic and economic-statistical designs of the side sensitive
group runs (SSGR) chart is presented in this paper. In the economic design, a simplified …