- Scope
- Post-impression viewthrough follows from one or more ad exposures where there was no click event
- Although the focus here is on display media, viewthrough or passive response could come from email, affiliate advertising, online PR and "dark" social media
- Apart from Google's self-serving studies, no independent research validates the notion of a paid search viewthrough
- Relation to Clickthrough
- Distinguished from post-click visitation or conversion
- Measurement
- Can be a success metric like a conversion, high-value task or a site visit
- Can be measured by a brand on its' own Web properties through site analytics
- Can be measured more broadly (competitor/peer site visitation, search, etc...) through panel-based research
- May be subject to attribution rules, such as first touch, last touch, equal touch or staistically derived techniques
- Time
- Is subject to a lookback and lookahead window that is configured by the ad server
- Viewthrough impact decays over time from the initial ad exposure
- Calculation
- The VTR (viewthrough rate) is calculated as # of viewthrough / # of impressions (viewed impressions preferably)
- Impressions should be based on "viewed" or "viewable" for most accurate measurement
- In-flight viewthrough are observed during a live ad campaign, while the post-flight viewthrough "vapor-trail" can be observed when the campaign ends or is paused
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