How do I measure the lift from my Mother's Day discount offers?

Measuring True Lift from Mother's Day Discount Offers

Lift measurement isolates the incremental impact of your discount offers by comparing the behavior of customers who received an offer against those who did not. Without a holdout group, you cannot determine how much of your Mother's Day revenue was caused by your offers versus the natural holiday demand spike that was already going to convert.

Lift Calculation Framework

Setting Up a Holdout Group

• Random 10-20% holdout - Withhold the offer from a randomly selected subset of visitors during the campaign window; compare their behavior to the group who received the offer
• Matched historical comparison - If a holdout is not feasible, compare your offer-period conversion rate to the same two-week window from the prior year, adjusted for overall traffic growth
• Product category holdout - Show the offer on some product categories but not others; compare conversion rates across categories to estimate incremental lift

Interpreting Results

If revenue per visitor is higher in the offer group despite lower AOV, the discount drove enough volume to offset the margin cost. If revenue per visitor is the same or lower in the offer group, your discount primarily reduced margins without producing incremental conversions - a signal to narrow your targeting criteria in next year's campaign.