“…Another strand of application is the modelling of volatility in daily and infra-daily financial time series (e.g. Asai, McAleer, and Peiris, 2020;Bisaglia, Bordignon, and Lisi, 2003;Bordignon, Carporin, and Lisi, 2007). In this context, Voges and Sibbertsen (2021) introduce a bivariate extension of model ( 14) and seasonal multiple local Whittle estimation in order to study cyclical fractional cointegration in half-hourly trading volume and realised volatility of the component stocks of the Dow Jones Industrial Average index.…”