Absolute top impression share: Definition
This article only applies to the new AdWords experience. Determine which AdWords experience you’re using.
A metric that shows the percentage of your Shopping ad impressions that are shown in the most prominent Shopping position.
Absolute top impression share = absolute top impressions / total eligible top impressions
Absolute top impression share is a good way to understand how prominent your products are compared to competitors and your opportunity to be more prominent by increasing your bid or budget. ATIS is available for campaigns, ad groups, and product groups (for Shopping campaigns).
There’s only one “absolute top impression” per auction so your absolute top impression share is an important indicator of your overall prominence.