The only possible way to differentiate between the legitimate and fraudulent user sessions is to use a statistical scoring system. Check out Clicklab http://www.clicklab.com/. We are applying several dozen tests to each visitor session to detect fraudulent signatures, and calculate the Click Inflation Index as the ratio of the sessions deemed fraudulent to total number of sessions.
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The only possible way to differentiate between the legitimate and fraudulent user sessions is to use a statistical scoring system. Check out Clicklab http://www.clicklab.com/. We are applying several dozen tests to each visitor session to detect fraudulent signatures, and calculate the Click Inflation Index as the ratio of the sessions deemed fraudulent to total number of sessions.