GARCH and sign-type tests against general dependencies and asymmetries. The procedures proposed provide exact versions of … following. Whereas univariate exact tests indicate significant serial correlation, asymmetries and GARCH in some equations, such … matrice de covariance des erreurs. Nous considérons des tests contre la dépendance sérielle, contre la présence d'effets GARCH …

We consider estimates of the parameters of GARCH models of daily financial returns, obtained using intra-day (high … not exist. In particular, we consider estimation in this way of an ARCH approximation, and obtain GARCH parameters by a … estimés des paramètres des modèles GARCH pour les rendements financiers journaliers, qui sont obtenus à l'aide des données …

the stochastic variance. Our class encompasses the usual GARCH models and various asymmetric GARCH models. Moreover, our … natural extension of the weak GARCH models. Our extension has four advantages: i) we do not assume that the fourth moment is … finite; ii) we allow for asymmetries (skewness, leverage effect) that are excluded by the weak GARCH models; iii) we derive …