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Data Analysis with R is a completely free course for anyone to take.
Pro Data Analyst nanodegree available
Udacity offers a Data Analyst nanodegree, which teaches R along with other relevant skills (MongoDB, Data Visualization and more).
Pro All courses are self-paced
Courses are always made available which means there is no waiting for the specific course you want to run. You can work through the courses as fast or as slow as you want.
Con Nanodegree is expensive
The specific course is free. However, if you want to take the Nanodegree, the cost is $200/month (estimated to take 9-12 months to complete).