I was going to setup google analytics for my blog, but after some research I found some negative (if true) sides of the tool:
A person claims that his pages got pushed down in the search results as they where all affiliate pages, that didn't stay on to long. This means that google analytics are collecting data from your site, and actually "nerf" your rankings.
Can this be true? and if so, how long should a visitor stay on your site for google to grant your site "a good visitor expereience"?