What is the denominator in advertising share of voice?

For an exposure-count definition, a brand’s share is its valid ad exposures divided by valid ad exposures for all included brands within the same study scope. Both sides need the same platforms, dates, sample, counting rules and exclusions. A duration-based measure needs its own definition; it should not be interpreted as an exposure-count share.

Audience reach is a different measure

One participant can see several brands. Their audiences can overlap, so brand reach figures should not be added as if they were mutually exclusive shares. For a participant reach proportion, identify the numerator as valid participants who saw the brand and the denominator as valid participants eligible for that comparison.

The observed distribution depends on participant selection, platforms and the observation window. Without suitable support for population inference, it does not establish national advertising spend, sales share or exposure across every platform. State how unidentified and uncovered records are treated rather than leaving them invisible to the reader.

Agree on the denominator before the study

SOV currently uses project consultation to establish goals, participants, platforms, dates and deliverables. Set the measurement unit, included brands and denominator before choosing audience breakdowns. This makes it possible to distinguish a change in observed advertising from a change in the boundaries of the comparison.