While seasonal effects for both advanced and emerging markets have been investigated extensively in mean and variance equations, Arab region asset markets have received much less attention. The objective of this article is to fill this gap in the literature by investigating the day-of-the-week...

The sum of squared intraday returns provides an unbiased and almost error-free measure of ex-post volatility. In this paper we develop a nonlinear Autoregressive Fractionally Integrated Moving Average (ARFIMA) model for realized volatility, which accommodates level shifts, day-of-the-week...