8fcb62ec_rics___Introduction___FT_Press__Considerations
[0] 2.6 [Metric] Heavy Usage Index [Construction] Category purchases by customers of a brand, compared with purchases in that category by average customers in the category. [Purpose] Measures relative usage of a category by customers for a specific brand. [Considerations] 
Can use either unit or revenue sales.
Marketing Metrics: Understanding Market Share and Related Metrics | Introduction | FT Press
Considerations