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?
