[edX] learning R

I started to learn R at the HarvardX data science series at edX.

Here is the list of the courses

1. R Basics
2. Visualization
3. Probability
4. Inference and Modeling
5. Productivity Tools
6. Wrangling
7. Linear Regression
8. Machine Learning
9. Capstone

Each course provides the direct interaction in DataCamp.
I took the course as an audit member, which is free.
But, DataCamp gave me the certificate of the course accomplishment when I finished the drills of the course.
I finished the course 1, 2, 3, and 5. I will follow up the rest of the courses.

This is the extra document of Rafa's course : rafalab.github.io/dsbook/
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