Prerequisites for Elements of Statistical Learning I am working through Elements of Statistical Learning, and unfortunately have found great difficulty in following the math. I have taken the standard series of Calculus courses (i.e., up to multi-variable calculus) and linear algebra, and have taken introductory (non-calculus-based) statistics and econometric courses. 

Please  let me know if there are any courses or textbooks you would recommend in order to get my mathematics/statistics knowledge up to speed. For example, I am considering working through the relevant portions of Statistical Inference (Casella, Berger) as a prereq.

Thank you!
The authors of Elements of Statistical Learning have come out with a new book (Aug 2013) aimed at users without heavy math backgrounds. 

An Introduction to Statistical Learning: with Applications in R

Download from here: http://faculty.marshall.usc.edu/gareth-james/