A good discussion of Multiple regression basics from NYU Stern ..

While I was going thru some material on Multiple regression and wanted to carry out a research by using multiple regression tool, I found this Stermn School of Business  document on Multple regression to be really useful. (though on Minitab ..) 

http://people.stern.nyu.edu/wgreene/Statistics/MultipleRegressionBasicsCollection.pdf

It is also simple and explains the concepts neatly in very simple language and examples.

Thank you Prof Greene ..

ge..