Example for today: Adsense -> 352 Page Impressions smartstats stats-> 1,037 Visits / 6,120 Page views To belive to adsense or smartstats? What am i missing here?
Some visitors may leave before the ads are displayed. Some visitors may have javascript disabled. Some may be on such old browsers they can't display iframes (although unlikely). Some visitors are bots and crawlers. The hours in sitestats day may not be the same hours in an AdSense day? There are many different ways traffic will not pull an ad, but it's anyone's guess as to exactly which ones. It just comes down to 'Do you trust Google or don't you'? But as long as they keep sending me money, I'll keep trusting them.