derived index造句

The "'Forage Value Index "'is a derived index of the relative change in the previous year s average monthly rate per head for pasturing cattle on privately owned land in the West.
Researchers from ABMI and the University of Alberta using the oil sands industry of Alberta as case study in their paper in which they challenged the economic prudence of the costly equivalency-based biodiversity offset systems by using ABMI's " empirically derived index of biodiversity intactness to link offsets with losses incurred by development ."
It's difficult to find derived index in a sentence. 用derived index造句挺难的