how do you fit a time series model why is in-sample forecasts lagged? what is the difference between in and out of sample fit? what type of forecast is for in sample fit? what is an out of sample based forecast which is also called an out of sample forecast what is the difference between in-sample and fitted value is a fit in sample what is forecasted values what does in-sample forecast mean what is the purpose of forecasted what does forecasted mean in a time series what is the difference between a fitted and forecast value what is an out of sample forecast? which term refers to the fitting of a time series? what is the meaning of the term in-sample what is the difference between in sample and fitted what is a lagged forecast what is meant by forecasted what is in-sample forecast