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Quantcast Cookie Undercount Compared to Google Analytics?

Cookies on Quantcast vs Google Analytics

     
11:18 pm on Mar 19, 2012 (gmt 0)

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We implemented quantcast tracking code recently for the first time.

We expected the quantcast cookie numbers to closely match our google analytics unique visitors numbers (which is a cookie count).

They don't. For any given day the quantcast cookie number is 74% - 79% of the google unique visitors number. (I am comparing Quantcast global cookies to google analytics unique visitors number).

The page views as measured by quantcast however are 99% of the google analytics numbers.

Do others have this same undercount on cookies via quantcast compared to google analytics?

The accurate page view count shows this is not a tagging issue. The pages are tagged the same.

What would explain this? If I understand correctly quantcast is a third party tag while GA is a first party. Would this explain the difference? If so why is the page view number the same?
5:51 pm on Apr 16, 2012 (gmt 0)

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Quantcast always vastly underrates.

Comscore is even worse, but in their case they do it as a form of blackmail. If you pay them they'll suddenly think you're getting more traffic.
 

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