The market’s line estimation implicitly assumes that its parameters are constant over time. Investors, who use the beta of this line for build their portfolio, have a similar behavior whatever their investment horizon. We discuss this hypothesis in this article using the technique of wavelets...

The CAPM theory provides a measure of the sensitivity of an asset to the market called the systematic risk. The Beta of equity is estimated by its market line. According to the OLS hypothesis, it is stable over time but this is not empirically verified. Many studies are in favour with this fact...

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...

The Rolling-Regression are currently used to study the parameters stability over time. In finance, we can analyse the time evolutions of systematic risk relaxing the constant-Beta hypothesis. This method can be associated with a wavelet decomposition of the variables in order to the parameters...

In this article, we propose an innovative way for modelling oil bull seasonals taking into account seasonal speculations in oil markets. Since oil prices behave very seasonally during two periods of the year (summer and winter), we propose a modification of Mackey Glass equation by taking into...

Résumé: Nous étudions la puissance en terme de prévision des processus basés sur la méthode du noyau en utilisant la version non paramétrique du critère « Final Prediction error » pour identifier un processus fonctionnel hétéroscédastique. Cette identification nécessite une...

Résumé: Nous étudions la puissance en terme de prévision des processus basés sur la méthode du noyau en utilisant la version non paramétrique du critère « Final Prediction error » pour identifier un processus fonctionnel hétéroscédastique. Cette identification nécessite une...