Sometimes the quality of a process is best expressed by a relationship between response
variables and explanatory variables. Checking over the time the stability of such functional …

Process monitoring is regarded as a continuous phenomenon requiring careful
consideration to acquire an enhanced output quality. Dispersion and location are significant …

Abstract Service failures can be manifested through customer complaints in the form of
negative reviews. It is vital for businesses to monitor the occurrence and severity of customer …

The adaptive multivariate EWMA (MEWMA) charts have been widely recognized as an
efficient process monitoring tool because of their ability to quickly respond against the shift of …

Simultaneous monitoring of the mean vector and covariance matrix in multivariate processes
allows practitioners to avoid the inflated false alarm rate that results from using two …

Variable parameters (VP) schemes are the most effective adaptive schemes in increasing
control charts' sensitivity to detect small to moderate shift sizes. In this paper, we develop …

Multivariate multiple profile monitoring has been studied extensively over the past few years.
Most of these studies assumed that the observations are uncorrelated, which could be …

Many studies have shown that industrial as well as non-industrial business organisations
present a growing need of robust and more efficient multivariate monitoring schemes in …

There has been a growing interest in research regarding monitoring a process through a
regression model (called a profile) rather than a simple quality characteristic. This paper …

In this paper, Phase II monitoring of multivariate simple linear profiles is considered when
the independency assumption of observations within each profile is violated. Then, two …