Warehouse data that results from calculations or processing applied to the source data before it is stored in the Warehouse environment. For example, source data might be used to calculate ROI (Return On Investment) which is stored as derived data in the Warehouse.
Data that is the result of a computational step applied to reference or event data. Derived data is the result either of relating two or more elements of a single transaction (such as an aggregation), or of relating one or more elements of a transaction to an external algorithm or rule. DAMA web site at www.dmreview.com