Audited - unaudited traffic

Can somebody please explain what is this?

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This is from the Chitika's FAQ :

Every month Chitika audits the clicks that we receive from all of our publishers sites. In the audit process we remove any invalid clicks such as: repeated clicks from the same ip. This is done to protect our advertisers from fraudulent clicks.

From your experience is there a big difference between those?

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Check this thread : http://www.webdigity.com/index.php/topic,909.0.Chitika+feedback+on+audited+reports.html

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