The Shewhart, Bonferroni-adjustment and analysis of means (ANOM) control chart are typically applied to monitor the mean of a quality characteristic. The Shewhart and Bonferroni procedure are utilized to recognize special causes in production process, where the control limits are constructed by...

Logistic regression (LR) is one of the most used estimation techniques for nominal data collected in contingency tables, and the question arises how the recently proposed concept of nominal correlation and regression (NCR) relates to it. (1) LR targets the cells in the contingency table while...

In this article the author examines, based on the inflation rate and unemployment rate registered in Romania during 1993-2004, how to show Okun's Law. Results consist of two distinct models explaining the dependency between the GDP’s growth rate of and the unemployment rate’s growth and vice...

The Republic of Mozambique is experiencing a significant social and economic change and needs an updated informative base to allow policy-makers to found their decision on reliable and comparable data. The fast development of the Non Observed Economy (NOE) was one of the most important...

This empirical study proposes a dependency analysis of monthly financial time series. We use the overlapping technique and non-parametric correlation in order to increase both accuracy and consistency. Copulas are used to test extreme co-movements between financial securities. Our results...

In this paper we perform a comparative study of the forecasting properties of the about 30 alternative leading indicators for Germany using the growth rates of German real GDP. In addition to them, we have constructed a diffusion index based on the principal component analysis and including 145...

We use the stochastic volatility model as a basis for investigating the statistical properties of absolute returns as a measure of latent volatility in financial markets. Our results are compared with existing results for squared returns.

Sur la décennie passée, la croissance de la productivité a souffert dans la zone euro d’une série d’ajustements sectoriels ; le caractère transitoire de ces ajustements permet d’envisager une accélération structurelle de la productivité.

This paper demonstrates the flaws of co-persistence theory proposed by Bollerslev and Engle (1993) which cause the theory can hardly be applied. With the introduction of the half-life of decay coefficient as the measure of the persistence, and both the weak definition of persistence and...

This paper studies single equation instrumental variable models of ordered choice in which explanatory variables may be endogenous. The models are weakly restrictive, leaving unspecified the mechanism that generates endogenous variables. These incomplete models are set, not point, identifying...