Moving Average Sometimes called a rolling average, the moving average is used tocalculate an average for a specific period: for example, to calculate the average numberof new hires each month for the past 12 months. As the number for the most recentmonth is added, the oldest number is dropped.Weighted Average A weighted average is used to compensate for data that may be outof date; the more current data is multiplied by a predetermined number to better reflectthe current situation.Weighted Moving Average The weighted moving average calculation assigns moreweight to current data with the use of a predetermined number and drops the oldest datawhen new data is added.