Data Analysis examples with code in R

http://www.ats.ucla.edu/stat/dae/

Excellent…..

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Making sense of PCA an difference with OLS

Look at this:

http://stats.stackexchange.com/questions/2691/making-sense-of-principal-component-analysis-eigenvectors-eigenvalues

http://math.stackexchange.com/questions/1146/intuitive-way-to-understand-principal-component-analysis

http://www.cs.otago.ac.nz/cosc453/student_tutorials/principal_components.pdf

http://www.cerebralmastication.com/2010/09/principal-component-analysis-pca-vs-ordinary-least-squares-ols-a-visual-explination/