Google analytics stats: 04 june 2012 Visits: 4.423 Unique visitors: 3.558 Pageviews: 77.352 Pageviews / visit: 17,49 Visit length: 00:06:26 Bounce rate: 1,09% 05 june 2012 Visits: 4.652 Unique visitors: 3.825 Pageviews: 45.087 Pageviews / visit: 9,69 Visit length: 00:06:45 Bounce rate: 19,60% From one day to another the bounce rate went from 1% to 19%, the pageviews dropped by half so did the pageviews/visit. The only thing I changed (If I remember correctly) on the site, was an advertisment that used a javascript. Could this be the reason? and, if it is, how can I know which one is the real stats?