Frequency is the % of times Adthena sees a competitor when conducting our searches.
Example
If Adthena searches for "black dress" 100 times and sees competitor retail-brand.com showing an advert on 50 of those occasions, then retail-brand.com will have a frequency = 50% on that specific term.
If retail-brand.com is appearing on multiple terms, then the aforementioned % will be weighted according to the average monthly search volume of each term.
Using the two search terms "black dress" and "black cocktail dress", which Google tells us have an average search volume of say 3,000 searches per month and 300 searches per month.
Retail-brand.com appear on "black dress" 100% of the time and "black cocktail dress" 50% of the time. Rather than showing a resulting average frequency of 75%, this example scenario will be weighted based on the fact that "black dress" is searched for 10x more often, so the frequency will be 95%.
Calculation: (100% x 3,000 + 50% x 300) / (3000 + 300) = 95.45%
Note however that Frequency only includes the terms that a competitor appears on.
Share of Impressions is the Estimated impressions* on a group of terms / the total available impressions over the selected period for all terms included in the filters, even those that a competitor has not appeared on.
In the example above, where there were only two terms and the competitor appeared on both, the Share of Impressions will also be 95%. If we include a third term that the competitor has not appeared on, then the Frequency will remain the same but the Share of Impressions will drop (as there were more impressions available for them to appear on).
*Estimated Impressions is the sum of Frequency x Average Monthly Search Volume (for each competitor and each search term).
Calculation: (100% x 3,000 + 50% x 300) = 3,150
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