The new Forecasting capability allows you to estimate future values by projecting data values based on the historical data. Tableau 8.0 provides built-in statistical models to forecast your data including models that account for seasonality and trends.
Predicting future values is by its nature imprecise, but using extensive data from the past can help give us an idea of what to expect in the future.
This dialog describes the factors used in the forecast and the forecast model.
Forecasts are created from models, and this dialog describes the model that is being used to calculate the forecast.
This dialog lets you adjust the forecast based on forecast length, date, or model.
Tableau automatically recommends a forecasting model, but you may have a reason to change it based on your knowledge of your data.