A quick read on whether a media vehicle over- or under-delivers your target. An index of 100 means parity with the general population. Over 100 means concentration. Under 100 means you are buying reach you probably cannot use. It is a starting filter, not a final answer. High index with low reach is still a niche buy.
Ad tech glossary
Audience Index
Technical definition
A metric comparing the concentration of a target audience in a particular media vehicle to their concentration in the general population.
The ADLINGO translation
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Where this shows up
Guide: How Much Does Programmatic Really Cost?
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