Nate Silver in my opinion is one of the smartest people out there when to comes to trend/data analysis. http://fivethirtyeight.blogs.nytimes.com/2011/08/08/why-s-p-s-ratings-are-substandard-and-porous/?hp i’m posting this here instead of General Discussion cause the article talks about a lot of regression techniques that are big topics for the L2 exam. enjoy.