# Lift / incremental lift

URL: https://idukki.io/glossary/lift
Category: Metrics
Also called: incremental lift, incremental conversion

The conversion delta between the test arm and the control arm in a holdout test. The only honest measure of UGC impact; everything else is a vanity number.

## Related terms

- [Holdout test](https://idukki.io/glossary/holdout-test)
- [CR / Conversion rate](https://idukki.io/glossary/conversion-rate)