“…3 The key advantage of the WN-FGLS is that it allows us to control for three statistical aspects of the data and model that are important to the forecasting exercise. These issues relate to endogeneity already recognized as an issue in the predictability literature (see Sharma, 2016); persistency of predictor variables such that instead of diluting the information contained in predictor variables, we can use the variables in their level form; and heteroscedasticity-an issue recognized as a stylized fact in financial time-series data (see, e.g., Devpura et al, 2018;Phan, Sharma, Tran, 2018;Sharma, 2016; among others).…”