Attribution Window
An Attribution Window (Lookback Window) is the period during which a marketing system considers a user’s interaction with an advertisement when determining the source of a conversion.
Simply put, it is the time interval between a user’s contact with an ad and the completion of a desired action, within which the system is allowed to “credit” that conversion to the advertising channel.
How an Attribution Window Works
When a user interacts with an advertisement—for example, by clicking on it or simply viewing it—the system starts counting down a set period.
If during this time the user:
- makes a purchase;
- submits a request;
- registers;
then the conversion will be attributed to that ad contact.
If the action occurs after the set period, the system will no longer link it to that advertisement.
Types of Attribution Windows
- Click-through window
A conversion is counted if the user clicked on the ad and then completed the action within a specified time.
For example:- Ad click → purchase 5 days later → conversion is counted with a 7-day window.
- View-through window
A conversion is counted if the user saw the ad but did not click on it.
For example:- Banner impression → user later visits the site independently → makes a purchase.
Examples of Attribution Windows
Advertising systems often use periods such as:
- 1 day
- 7 days
- 14 days
- 30 days
The choice depends on the product type and the length of the purchase cycle.
Why Configure the Lookback Window
A properly chosen window helps to:
- more accurately assess the contribution of advertising to sales;
- correctly allocate the marketing budget;
- understand the real customer journey;
- compare the effectiveness of different channels.
How to Choose the Right Window
Typically, the following are considered:
- the length of the purchase cycle;
- the cost of the product;
- the number of user touchpoints;
- audience behavior.
For example, for impulse purchases, the window might be short, while for complex B2B products, it might be significantly longer.
Key Takeaways
The attribution window is the time period during which a user’s interaction with an advertisement can be linked to a subsequent conversion.
The accuracy of advertising campaign effectiveness analysis and the allocation of the marketing budget depend on the correct configuration of the Lookback Window.
