“…the estimates are obtained based on past time series data. 3 See for example, Engle (1982), Taylor (1986), Bollerslev, Chou and Kroner (1992), Wei and Leuthold (1998), Engle (2002), among many others. 4 However, the out-of-sample forecasting accuracy of this type of non-linear models is, in some cases, questionable (see Park and Tomek: 1989, Schroeder et.…”