SEASONAL ADJUSTMENT FACTORS

(Data Analysis) Mathematical indexes used to adjust for the intra-year normal seasonal fluctuations in time-series data. In its simplest form, such indexes may be derived from dividing the value of each observation by a simple moving average centered over each data observation with such an average encompassing the six-month period before and after the observation. More sophisticated seasonal adjustment processes may also account for the placement of weekends and holidays and other factors affecting data behavior. Also see Seasonal Factors.