We identify and examine the presence of the long memory in equity returns and more generally in specific transformations of these returns, on both the US and European stock markets. Taking into account the persistence phenomenon, we analyze the effect of the splitting of the sample period on the...

The Beta coefficient theorized by the CAPM is estimated by the Market Line. By hypothesis, the Beta is stable over time but empirical studies on it volatility don't confirm this fact. One of them is related to with agent heterogeneity hypothesis. In this paper; we study this hypothesis by...

Cet article vise à analyser le comportement cyclique de la série du cours de l'action Orange du 03/01/2000 à 02/02/2017 par la recherche de la non linéarité à travers d'une classe de modèles non paramétriques hétéroscédastiques, notée NAR-ARCH. L'identification des modèles non...

This paper aims to analyze the cyclical behavior of stock exchange Orange prices from 01/03/2000 to 02/02/2017 by the research of nonlinearities through a class of heteroscedastic non parametric models. The identification of non parametric models requires the selection of the Markov coefficients...

L'analyse des corrélations, constitue le pilier d’une stratégie réussie de diversification du portefeuille d’actions. Plus faibles sont les corrélations au sein d’un même portefeuille, plus importants seront les profits potentiels que nous pouvons en obtenir. Dans un contexte local,...

The analysis of correlations forms the basis of portfolio diversification and the lower the correlation between two assets the greater the potential benefit to be obtained by diversification. In the national context this typically involves the analyses of the correlation between the returns on...