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europeforvisitors - 11:38 pm on Nov 21, 2007 (gmt 0)
Every statistics outfit has its own methodology, and the numbers don't always mean what an outsider might think they mean. For example, several of the big services consolidate traffic from all of a company's properties under one umbrella--at least if that's what the company wants--and they allow sites to assign their traffic to a third party (such as an ad network or rep firm). This isn't necessarily shady, but it can be confusing at times.
Hit wise data is logs & aren't the others panels? I don't know where ComScore/Nielsen come up with their numbers but they never seem to reflect the traffc patterns on any site I've seen.