how many steps ahead does rugarch forecast when can the ugarch forecast be used one step at a time? ugarch forecast function how far ahead does ugarch forecast how many times can a forecast be used ugarch forecasting how many forecasts can be roll what does n.ahead parameter mean what is n.roll what is the forecasting n.ahead argument what the n.roll argument means how to forecast from a single observation ugarch forecasting function how do i forecast a step ahead which argument should be used to forecast one step ahead ugarch forecast how long to use n.roll for forecasts what is the forecast value for ugarch fit how many times can i forecast ahead what is the forecast variable on ugarchfit