Did the promotion increase contribution as well as revenue?

Compare randomized per-unit net revenue and contribution, including non-buyers. Declare the observation window or study design before running. The result includes denominators and leaves unidentified quantities uncomputed.

Required data: Assignment unit ID · Treatment (0/1) · Net revenue after discounts/refunds · Variable cost · Currency code

Discounts are not subtracted twice. Pull-forward, substitution and fixed costs are reflected only when included in the input.