OM-ADDITMON Cost: $12 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions OM-ADDITMON: Excel Spreadsheet Template for Additive seasonal adjustment for monthly data: If your data contain a seasonal pattern, perform a seasonal adjustment before you apply exponential smoothing. Seasonal adjustment removes the seasonal pattern so that you can concentrate on forecasting the mean or trend