A study of click fraud by Fair Isaac found 10 to 15 percent of ad traffic is "pathological," and is more of a problem than companies like Google and Yahoo want to admit.
Fair Isaac has found in its research since August 2006 that the figures cited in their study mirror those from Click Forensics.
A report in the
Both Google and Yahoo have taken issue with third party click fraud claims before, as they claim their systems throw out illicit clicks before they ever impact an advertiser's account. Google has even said they detect all but about 0.02 percent of the click fraud affecting their AdWords clients. 
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