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Here is the header of the table from a random screenshot found with an image search:

http://forums.makingmoneywithandroid.com/attachments/adverti...

Pretty sure that's CTR. It's really not that hight considering we're talking about a mobile app. People tend to tap at ads when they're trying to do something else, and that often leads to insanely high CTRs.

Pretty sure this dude is paying someone to click on his ads and generate impressions so that the CTR is average.

80% CTR would be stupidly high, mobile app or not, anything over 5% would already be incredibly good.

The 80% figure is fill rate (AKA the percentage of impressions to requested placements), the 1.80-2.00% figure is the CTR, which matches the third column being impressions and fourth clicks.

It appears its Fill Rate. (Click Through rate is around 2%).

It appears to me that dev is involved in shady stuff (The fact that dev posted this in several forums without ever posting link to his app should be noted).