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Perhaps I've missed something on how adsense works, but I wonder if anyone can explain this:
In my adsense account I usually have between 1,000 and 3,500 impressions per day - this is for about 4 sites (inclusive). But when I check my site stats (of which I have 5 seperate kinds), I know that some of my sites have around 15,000 pageviews per day. I would guess for the 4 sites they have about 30,000 page views. Am I missing something, doesnt impressions add up to pageviews? I have the adsense on all pages of these sites?
All I can think of is google is basing impressions on unique vistors who are feed impressions over a period of perhaps 24 hours.... but even at that the sites get much more unique vistors!
Is it possible to google only serve about 1/4 of page views with ad blocks? - I've never experienced this though!
It should be the last piece of code on your page. otherwise it would count page views on pages that did not load all the way.
If you put a php script at the top and one at the bottom of a page there is often a large difference.
Usually adsense shows a little after page content which would mean there was even more discrepancy.
Also I don't think PSA's count as impressions
We experimented for quite a while with different counters and found Awstats to be one of the most accurate for ease of use however we do also use a couple of web log analysers.
The difference between Webalizer and Awstats showed that anywhere between 20% to 50% on even busy sites were actually spiders/bots.
Insofar as Adsense inaccurate page impressions are concerned I have been complaining about this since 5th May 2005, otherwise known as 05/05/05, and I have never read so much canned clap trap from Adsense support. They have clearly had an issue with our sites and, until yesterday, according to Adsense our traffic was down by some 40% over the past couple of months, remarkably, as I commented in this thread this morning, [webmasterworld.com...] our traffic has suddenly returned to normal even though all our statistics prove that they have not changed since 5th May!
We'll see how today pans out however I have fingers crossed that Adsense loves me again.
So maybe you have been subjected to the same problems we have had therefore how did your stats for yesterday look?
The list goes on and on.
If you had multiple ad units on a single page, only after May 5th did the Adsense page views count come close to being accurate. With adlinks and another ad unit it was always 2X too high.