Forecast Pro includes a weighting transformation which will divide your historical data by user-defined weights, forecast the resultant (deweighted) series and then multiply (reweight) the forecasts. This procedure can be useful in a variety of situations including adjusting for the number of working days in a month, defining a seasonal pattern and supplying a growth curve for a new product.

In this section we will use the weights procedure to adjust for the number of weeks in each forecast period. The section will conclude with a discussion of how to apply weights in other situations.