is the forecast model still valid what model is still valid are forecasts valid what model is forecasting still valid why isn't x$ still valid when does the forecast valid can you estimate k$ with a forecast when do you forecast with arima how to forecast a gap is the forecast model developed now valid? which model is valid for forecasting? how to predict the current price of $y what model is used to estimate a forecast what is the correct forecast model used can i calculate forecasting with forecasting when a forecast model is developed, the model is not valid. how to predict when a model is still valid? how to forecast with ARIMA regression is an arima forecast valid is arima still valid