These are my notes and solutions to The Analytics Edge course on edX.
https://cran.r-project.org/doc/contrib/Short-refcard.pdf
https://drive.google.com/file/d/0B5xZMW_NyNfFNDFyLXoxV0tQaHM/view?pref=2&pli=1
https://docs.google.com/document/d/1MXVZEmM8KXiuXLeo424rxhkwgiEWDnX3jrKJd-ozCKU/edit
https://docs.google.com/document/d/19DZe_iKKs4OCSxolURpM13rZk3e1WGklUDmiGn3F_zg/edit