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Gross Impression and Unique Impression
One visitor can view many
ads. A raw/gross impression is counted every time the ad is displayed to any visitor. It includes duplications. On the other hand, a unique impression is counted only when a visitor views an ad within a 24 hour-period. After 24 hours, viewing this ad from this visitor is counted again as a new unique impression. The reports for unique impressions/IPs show the activities of your visitors. Counting unique impressions depends on the information from the cookies stored on visitors' browser. Without cookies, a raw/gross impression is always counted as an unique impression.
Example
- Visitor A viewed: Ad1, Ad2, Ad3, Ad2
- Visitor B viewed: Ad1, Ad4
The results:
- Ad1 has 2 unique and 2 raw impressions
- Ad2 has 1 unique and 2 raw impressions
- Ad3 and Ad4 each has 1 unique and 1 raw impression
Relationship
Unique impression is always smaller than the raw number as one visitor usually sees more than one ad.
Similar terms
imp, exposure, view. Raw impression will be the default term and simply referred to as impression.
Other Articles in Overview
Reports on impressions, clicks, geographical, and technical data
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