Incrementality Testing
01 Definition
Incrementality Testing meaning: Incrementality testing runs controlled experiments to measure the true added impact of marketing.
Incrementality testing measures real causal impact by comparing a group exposed to marketing against a control group that is not. The difference in outcomes estimates the incremental effect. Common designs include holdout tests, geo experiments, and platform lift studies.
Also called
Why it matters
How Incrementality Testing fits the work
These tests give evidence of cause and effect that attribution alone cannot, helping you decide whether a channel deserves continued spend.
In context
The team ran an incrementality test, withholding ads from 20 percent of users, then compared conversion rates between the two groups.
Practical note
Valid tests need proper randomization and enough sample size; small or biased groups can produce lift figures that look precise but are unreliable.