Aggregating data by site vs by page
If you group, filter, or compare by page or search appearance, all metrics in the report are aggregated by page; otherwise, all metrics are aggregated by site.
For impressions, if a site appears twice on a search results page when aggregating by site, it counts as a single impression; if grouping by page or search appearance, each unique page is counted separately.
For clicks, if a site appears twice in search results when grouped by site, and the user clicks on one link, backs up, then clicks the other link, it counts as a single click, since the final destination is the same site.
For position, when aggregating by site, the topmost position of your property in search results is reported; when grouped by page or search appearance, the topmost position of the page in search results is reported.
When aggregating data by site, the site is the true target of the search results link, which might not be the same as the displayed URL, as determined by Google's skip redirect behavior.
Because of the different accounting methods, the click-through rate and average position are higher when aggregating by site if multiple pages from the same site appear in the search results. For example, imagine that search results for "fun pets for children" returns only the following three results, all from the same site, and that users click each of them with equal frequency:
Google Search Results
Metrics Aggregated by Site
Metrics Aggregated by Page
www.petstore.example.com/monkeys
www.petstore.example.com/ponies
www.petstore.example.com/unicorns
Click-through rate: 100%
All clicks for a site are combined
Click-through rate: 33%
3 pages shown, 1/3 of clicks to each page
Average position: 1
Highest position from the site in the results
Average position: 2
(1 + 2 + 3) / 3 = 2
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