Pre-processing 6 Ways to Address Collinearity in Regression Models | Learn it daily. August 10, 2015 tomix http://learnitdaily.com/six-ways-to-address-collinearity-in-regression-models/
Pre-processing How to Reduce Number of Variables and Detect Relationships, Principal Components and Factor Analysis August 10, 2015 tomix http://www.statsoft.com/Textbook/Principal-Components-Factor-Analysis