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Remember that not all of your page impressions result in adsense impressions. I'm behind a websense filter at work that blocks adsense, so if I visit your site, you'll see me in your web statistics, but not your adsense. If a person closes your page before it loads the adsense portion (which is usually one of the last things loaded) you'll see the same thing. I'm not sure how most ad blocking software works, but that would likely cause the same results as the websesne scenario that I mentioned above.
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