FAQ
You calculate incrementality by determining the difference in the conversion rate or outcome metric between the test group and the control group, and then scaling that difference across the total exposed audience. The formula is: Incrementality = (Test Group Conversion Rate) - (Control Group Conversion Rate) x Total Exposed Users. This calculation yields the incremental number of conversions that were genuinely driven by the advertising.
Incrementality is the measurement in scenarios where a marketer needs to validate the effectiveness of a channel or campaign and prove that the advertising spend is driving new, valuable customer action, rather than just capturing existing demand. It is the essential measurement when evaluating new channels, new creative campaigns, budget changes, or the performance of automated bidding strategies, particularly in retail media and other closed loop systems like those offered by FCC.
Yes, Marketing Mix Modeling (MMM) does measure incrementality, but it does so holistically and at a macro level, rather than at the user or campaign level. MMM is a top-down, statistical analysis that uses historical data (sales, media spend, external factors) to attribute sales lift to different marketing channels and non-marketing factors over time. It provides a macro view of the incremental value of marketing spend, which can then be combined with bottom-up experiments for a comprehensive view.
Incrementality is different from traditional attribution because incrementality measures causality, while traditional attribution measures correlation. Traditional attribution (e.g., last-click) simply tracks the final touchpoint before a conversion and assigns credit to it, but cannot prove the conversion wouldn't have happened otherwise. Incrementality, using control groups, proves that the ad caused the conversion, isolating the true lift, regardless of what the user's final click was.
Incrementality measurement is not always possible, as there are significant limitations. It requires a statistically significant sample size and the technical ability to accurately control and hold out exposure to the control group without contamination (leakage), which is difficult in small or highly fragmented campaigns. Furthermore, it is often costly and time-consuming to run experiments, making it impractical for every single campaign, especially those with very small budgets.
Incrementality relates to ROAS or ROMI by providing the most accurate input for calculating these metrics. While traditional ROAS uses total conversions, Incremental ROAS (I-ROAS) uses only the incremental conversions (the true lift) in the calculation. This results in a more honest and reliable measure of marketing profitability: I-ROAS = Incremental Revenue/Total Ad Spend.
No, incrementality is not the same as uplift modelling, although they are closely related. Incrementality is a measurement technique that relies on running A/B tests to measure the lift after the fact. Uplift modelling is a predictive machine learning technique that forecasts the individual incremental lift before the campaign runs, identifying which specific users are most likely to convert only if they are exposed to the ad, optimizing the targeting before the spend is even executed.
A brand should use incrementality measurement instead of relying on platform-reported conversions whenever making significant strategic budget decisions or when there is high skepticism about the true value of a channel. Platform-reported conversions are susceptible to attribution errors, fraud, and over-reporting due to the platform's self-interest. Incrementality provides the necessary third-party, scientific proof of the true causal impact, ensuring budget allocation is based on actual added value.
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