I compared my Google Analytics statistics with Piwik but i found huge differences at the referer statistics. I can understand the difference in Search / Campaigns because Piwik cannot read the gclid of Adwords but the numbers for “Direct” should not differ that much. The visits/pageviews are almost the same.
The tracking code is implemented on all pages. Otherwise the number of visits would be different.
I’ve deactivated the DoNotTrack features but i think that so many users are using this option. Are there any other possible reason for this bug? Do you know if Google is using its Search data for Analytics?