Hello! I'm new to PPC advertisement, and I would like to know if there is a recommended free management tool for PPC campaigns. I would like to ask some affiliates that manage such PPC – how do you make a statistic optimization of your PPC campaigns, if all the info you have is the behavior of the surfer in your site, but when one enters the vendor's site – you don't know which one from all the ones you've directed to the site, has done the purchase. Is there a statistic formula we can work with or a certain management tool that dose it automatically? Thanks!