[Q] Promotional Sales Lift - Promoted vs Non-promoted group of items- Desperate to figure this lift...

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[Q] Promotional Sales Lift - Promoted vs Non-promoted group of items- Desperate to figure this lift out!

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Violent_Zen is a queer person

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[Q] I have a group of promoted items and group of non-promoted items. I have been tasked with reporting back what the lift was for this promotion to our vp of sales.

Promoted Items- % Chg vs YA- Pre Promo 9.4%; During Promo 15.2%; 5.8 Point Change

Non-Promoted Items- % Chg vs YA- Pre Promo 23.4%; During Promo 25.7%; 2.3% Point Change

Point Change was 3.5 points higher in the promoted group

Everything I can find shows the formula for lift as being (Conversion Rate for Promo - Conversion Rate for Control)/Conversion Rate for Control. Would that mean lift is (5.8-2.3)/2.3= 155.7% ??

I was looking at it with a co-worker and they said the 3.5 points difference was my lift, but I not confident in that answer. I have looked at other explanations... even within this group, but Iam failing to understand.

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