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## How is lift is actually calculated ?  Level 3

Hi,

I have observed that in the results dashboard the lift is not accurate across many experiments.

According to Adobe help documents lift is = CR(Alternative)-CR(Control)/CR(Control)*100

As per the formula : [(0.17%-0.10%)/0.10%]*100 should be 70%

However it shows : 64.44% (Refer attachment).

Is there any other factor involved in the calculation ?

Regards

Yogita

1 Accepted Solution  Level 10

Hi Yogita,

The conversation rate displayed on the interface are rounded of to 2 digits However  the lift calculated at the back end from CR ( Control) & CR (Alternative) are not rounded of two digits

Let's say that CR( alternative) =0.16543 %= 0.17 %( rounded off)

CR (Control)= 0.09992 %=0.10 % (( rounded off) )

Hence

Lift =(0.16543-0.09992)/0.09992=65.56 %

However when rounded off= (0.17-0.10)/0.10= 70 %

Thanks & Regards

Parit Mittal

2 Replies  Level 10

Hi Yogita,

The conversation rate displayed on the interface are rounded of to 2 digits However  the lift calculated at the back end from CR ( Control) & CR (Alternative) are not rounded of two digits

Let's say that CR( alternative) =0.16543 %= 0.17 %( rounded off)

CR (Control)= 0.09992 %=0.10 % (( rounded off) )

Hence

Lift =(0.16543-0.09992)/0.09992=65.56 %

However when rounded off= (0.17-0.10)/0.10= 70 %

Thanks & Regards

Parit Mittal  Level 3

Hi Parit,

Thanks a lot for the explanation.

But isn't 5% quite a difference. Round off of 64.44% should come to 65% instead of 70%.

Regards

Yogita 