Sales period is number of days of sales history that we use to analyse and base our forecasting results on. This only affects the forecasting data in the main Products table - you will still see forecasting results for all periods when you open the detail view for each product.
We currently offer 5 different settings for sales periods / strategy’s:
90 days (weighted average)
90 days
60 days
30 days
14 days
By default, we have it set at 90 days weighted average setting as it should be the most accurate for an average store. It works by averaging out sales rate of each of the other periods which results in a forecast that still takes into account 90 days period but puts a higher importance on the most recent sales.
Simply put, weighted average takes into account sales trend - if a product is starting to pick up in sales recently, it will start suggesting higher reorder quantity to make up for the increased demand. And vice versa.