Statistics
A famous aphorism says, “There are three kinds of lies: lies, damned lies, and statistics,” meaning you can support any statement and sound authoritative, so long as you quote statistics. Fortunately, the statistics shown in an AdSense Ad Performance report are simple enough that they are hard to misinterpret, but you should be clear about the terminology used.
Each report will show you daily statistics (each of these is a column in the AdSense report, as shown in Figure 9-15):
- Impressions
An ad impression is recorded each time an AdSense ad unit is displayed. A page impression is recorded each time a web page containing an AdSense ad unit is displayed. A single display of a web page containing three ad units would produce one page impression and three ad impressions.
- Clicks
A visitor’s click on an ad on a publisher’s page. Public service ad clicks are not included in this statistic.
Note
Google reserves the right to audit clicks and retroactively remove clicks that it deems invalid—for example, if Google finds you have been clicking ads on your own pages. These clicks will show up in the report that is displayed, even though you won’t make any money from them.
- CTR
CTR (click-through rate) is the number of clicks an ad unit receives divided by the number of times the ad unit is displayed (ad unit impressions).
- eCPM
Effective CPM (eCPM; cost per thousand impressions) is calculated by dividing the total earnings by the number of impressions in thousands. For example, if a publisher ...
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