How do we measure lift?
Conversion Lift based on users measures the causal, incremental impact of your campaigns by measuring conversions from users who saw ads in the exposed group and users who were held back from finding ads in the control group. Cumulative results may be available during the study, but we recommend waiting until the end of your study to get the most accurate results.
Conversion Lift based on users metrics and statuses
Here’s how you check your Conversion Lift based on users data:
- In your Google Ads account, click the Goals icon
.
- Click the Measurements drop down in the section menu.
- Click Lift measurement.
- Here you can view incremental conversions and Relative Lift for all biddable conversions in table view, alongside campaign impressions, cost, and Brand or Search Lift metrics.
- Click on the study name to view detailed study results.
Metrics
Incremental conversions
Incremental conversions = exposed conversions - control conversions
The most fundamental metric of Conversion Lift is “Incremental conversions”, also known as "Absolute Lift". This metric reflects the incremental conversions or incremental conversion value you were able to generate due to your ad campaigns over the duration of the experiment. It’s computed as the difference between the exposed metric, which is the conversions or conversion value, from the baseline (control) metric.
Incremental conversion value
Incremental conversion value = exposed conversion value - control conversion value
The incremental conversion value, in local currency, driven by your campaigns in the experiment period.
Relative lift
Relative lift = Incremental conversions / control conversions
Relative lift reflects the percent growth in reported conversions between the exposed and baseline (control) arms. It’s computed as the incremental conversions, divided by the total metric of the baseline. As a result, relative lift can theoretically scale between -1 and infinity. For example, if 90% of your conversions are incremental, you’ll have 90 incremental conversions for every 10 baseline conversions, resulting in a relative lift of 90 / 10 = 900%. Very large relative lifts can easily occur for brands with low baseline conversion activity in the control group.
Confidence interval
This metric is the estimated range in which your Conversion Lift estimates fall. For example, you may find that your Relative Lift is 10%. This is your point estimate. In brackets, you’ll find the confidence interval from at least 8% to at most 12%.
Statuses
“Significant Lift Detected”
Lift is significantly positive and there are greater than 150 exposed conversions.
“Not enough data”
Lift is significantly positive but there are less than 150 exposed conversions or there was no significant lift detected and confidence interval half width is less than 2%.
“No Significant Lift Detected”
There’s no significant lift detected and the confidence interval half width is greater than or equal to 2%.
