Check out the analysis here.
These files explore the reslationship between red wine attributes and quality. They were put together during my participation in Udacity's course Data Analysis with R. The analysis is based on the dataset found in: P. Cortez, A. Cerdeira, F. Almeida, T. Matos and J. Reis. Modeling wine preferences by data mining from physicochemical properties. In Decision Support Systems, Elsevier, 47(4):547-553. ISSN: 0167-9236.