Among the process capability indices considered in the literature, Cpm is one of the most widely used, despite the fact that its performance often becomes unsatisfactory in the case of processes with asymmetric specifications, i.e., processes whose target value is not located at the midpoint of...

Mixed Poisson distributions have been used in a wide range of scientific fields for modelling non-homogeneous populations. This paper aims at reviewing the existing literature on Poisson mixtures by bringing together a great number of properties, while, at the same time, providing tangential...

Perakis and Xekalaki 2002, Journal of Statistical Computation and Simulation, 72(9), 707-718, introduced a process capability index that is based on the proportion of conformance of the process under study and has several appealing features. One of its advantages is that it can be used not only...

This paper presents a new methodology for evaluating the performance of a forecasting model. The evaluation-criterion utilizes a “credibility interval” centered at the model prediction. Given predicted and observed values, the length of the “credibility interval” is increased (or...

A synopsis of probability models for over- and underdispersion is provided, looking at their origins, motivation, first main contributions, important milestones, and applications. As the field of accident studies has received much attention, and various theories have been developed for the...

An overview of the evolution of probability models for over-dispersion is given looking at their origins, motivation, first main contributions, important milestones and applications. A specific class of models called the Waring and generalized Waring models will be a focal point. Their...

The paper proposes an approach to the two period inventory problem for items that have heterogeneous Poisson demands. A model is constructed whose appealing features reveals aspects of the nature of the optimal stocking problem that enable the manager to assess the degree to which demand is...

Most of the methods used in the ARCH literature for selecting the appropriate model are based on evaluating the ability of the models to describe the data. An alternative model selection approach is examined based on the evaluation of the predictability of the models on the basis of standardized...

The Generalized Waring Distribution is a discrete distribution with a wide spectrum of applications in areas such as accident statistics, income analysis, environmental statistics etc. It has been used as a model that better describes such practical situations as opposed to the Poisson...

This paper presents a modification of a method for constructing approximate lower confidence limits for the proportion of conformance of normally distributed processes, which was proposed by Wang and Lam (1996). The proposed method is very simple and its implementation does not require the use...