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Question 3, incidentally, says that under certain circumstances, a page view will not count as an impression. This is generally if, for one reason or another, the user's browser cannot dispay the ads.
Hope this helps.
So it's normally similar to the number of web pages (with adcode) you serve, minus cases where the ad code is not executed such as known robots and Netscape 4.
Doesn't make any difference how many pages an individual user/ip sees, so in your case one person (or more) viewing 5 pages counts as 5 impressions (minus the exceptions).
Remember that the Google day is Pacific Time, so impressions won't tally with stats using other days such as UTC.
After tracking for a couple of months, as far as I can tell all page views that the ad is served on are counted as impressions.
don't count "charity ads" as a pageview, to give us an indication of % of pages not being served targeted ads.
Visi, I'm with you on that. I mentioned that a few weeks ago after there was confusion about whether unpaid ads counted towards impressions. The result is impressions are misleading, CTR is inaccurate and like you said, it's difficult to determine what % of pages display target paid ads.