Conversion rate lift

What is conversion rate lift?

Conversion rate lift is the relative percentage difference in conversion rate between two groups of shoppers — typically those who engaged with a Flockr message versus those who did not. It is Flockr’s headline measure of commercial impact.

How is conversion rate lift calculated?

The order rate of the Flockr group (orders divided by sessions) is compared with the order rate of the baseline group, and the difference is expressed as a relative percentage. If the baseline group converts at 1.5% and the Flockr group at 4.0%, the lift is reported as roughly +167%. Positive lift is shown with a plus sign.

Why is conversion rate lift an upper bound, not a causal figure?

Because the measurement is observational, not a randomised experiment, and the two groups are not randomly assigned. The Flockr group selected itself by clicking a message, which makes it higher-engagement than the average session, so part of the gap reflects intent rather than Flockr. The product-scoped order rule narrows the gap but does not close it. The lift should therefore be read as an upper bound on the true effect — reliable for direction and for tracking change, not a randomised result.

How is conversion rate lift different from conversion rate?

Conversion rate is a single absolute number — the percentage of sessions that convert. Conversion rate lift is a comparison — how much higher one group’s conversion rate is than another’s, in relative terms. The rate describes a population; the lift describes a difference between two.