Step 4: Media Metrics and Analytics
Media plans are driven by questions of accountability. And because media
decisions are based on measurable factors, identifiable costs, and budget
limitations, media planners are engrossed in calculating the impact and efficiency
of their media recommendations.
Impact: GRPs and TRPs
Among the most important tools media planners use in designing a media mix is a
calculation of a media schedule’s gross rating points and targeted rating points.
Reach and frequency are interrelated concepts that, when combined, generate an
estimate called gross rating points. Gross rating points, or GRPs, indicate the
weight, or efficiency, of a media plan. The more GRPs in a plan, the more
“weight” the media buy is said to deliver.
To find a plan’s GRPs, you multiply each media vehicle’s rating by the number of
ads inserted into each media vehicle during the designated time period and add up
the total for the vehicles. Once the media vehicles that produce the GRPs have
been identified, computer programs can be used to break down the GRPs into
reach and frequency (R&F) numbers. These R&F models are based on consumer
media use research and produce data showing to what extent audiences, viewers,
and readers overlap.
A good media planner will look at several different mixes of programs that reach
the target audience, figure the GRPs for each, and then break this calculation into
R&F estimates for each plan. While gross rating points include exposure
duplication, knowing the GRPs of different plans is still helpful in choosing which
plan delivers more for the money budgeted.
How do you decide which is best? If a brand has a tightly targeted audience and
wants to use repetition to create a strong brand presence, then a plan that has a
higher frequency would be important. If a brand has a fairly simple message
where frequency is less important, a planner would probably choose a plan with
higher reach.
Principle: Reach and frequency are interrelated: when reach increases,
frequency decreases, and vice versa, within the constraints of the advertising
budget.
For products that have a mass-market appeal, households are often used in
targeting. However, for more specialized products, target audiences can be more
narrowly defined. Since the total audience obviously includes waste coverage, the
estimate of targeted rating points (TRPs) adjusts the calculation to exclude the
waste coverage so it more accurately reflects the percentage of the target audience
watching a program. Because the waste coverage is eliminated, the TRPs are
lower than the total audience GRPs. Targeted rating points are determined by
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