The EWMA control chart is used to detect small shifts in a process. It has been shown that, for certain values of the smoothing parameter, the EWMA chart for the mean is robust to non normality. In this article, we examine the case of non normality in the EWMA charts for the dispersion. It is...

Woodall and Montgomery in a discussion paper, state that multivariate process control is one of the most rapidly developing sections of statistical process control. Nowadays, in industry, there are many situations in which the simultaneous monitoring or control, of two or more related quality -...

In this paper we discuss the basic procedures for the implementation of multivariate statistical process control via control charting. Furthermore, we review multivariate extensions for all kinds of univariate control charts, such as multivariate Shewhart-type control charts, multivariate CUSUM...

The analysis of meditation as a factor of an individual’s psychological and emotional well-being as well as the comparison of main emotional intelligence quantitative measurement methods and the justification of the method used in the study were performed. Main features of the migrants’...

Cell Formation (CF) problem involves grouping the parts into part families and machines into manufacturing cells, so that parts with similar processing requirements are manufactured within the same cell. Many researches have suggested methods for CF. Few of these methods; have addressed the...

The paper presents the Romania tax framework concerning passenger cars taxation in a comparative manner in European context. This framework causes a lot of criticism from European officials and led to some reconsideration that shaped the actual form, which, in our opinion, can be further...

This paper relates to the experimental draft of the model of collaborative management of ICT practices for use in SME, developed as part of a project of the Centre de Recherche Public Henri Tudor. This model aims to propose to SME an optimized management of their respective information system in...

Control charts, known for more than 80 years, have been important tools for business and industrial manufactures. Among many different types of control charts, the attribute control chart (np-chart or p-chart) is one of the most popular methods to monitor the number of observed defects in...

Measurement error is a usually met distortion factor in real-world applications that influences the outcome of a process. In this paper, we examine the effect of measurement error on the ability of the EWMA control chart to detect out-of-control situations. The model used is the one involving...