Forecasting Overview
To ensure accurate forecasts, the reports make the following decisions:
To provide a good statistical sample, when you select a display range, the report uses historical data that is twice that display range.
If the full range of historical data is unavailable, the data that is available is used. For example, if you want to view data for January of the previous year to December of the current year, the Portal looks for four years worth of historical data.
Although the report forecasts the current period, the report ignores the current period when it derives statistical calculations. For example, if the current month is July and you request to view the report by months, the bar for July of this year will be forecasted and data for July of this year will be ignored for statistical calculations.