Abstract

In this paper we mainly study the existence of higher-order moments of periodic GARCH models ( P - GARCH) introduced by [Bollerslev, T., Ghysels, E., 1996. Periodic autoregressive conditional heteroskedasticity. Journal of Business and Economic Statistics 14, 139–152]. We provide an explicit necessary and sufficient condition for the existence of higher-order moments for a general P - G A R C H S ( p , q ) model. Our main result generalizes the necessary and sufficient moment condition recently obtained by [Ling, S., McAleer, M., 2002a. Stationarity and the existence of moments of a family of GARCH processes. Journal of Econometrics 106, 109–117; Ling, S., McAleer, M., 2002b. Necessary and sufficient moment conditions for the G A R C H ( p , q ) and asymmetric power G A R C H ( p , q ) models. Econometric Theory 18, 722–729] for the classical G A R C H ( p , q ) models.

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