Introduction to R Programming

Probably one of the best courses out there to get you started with R. It’s being offered by DataCamp in association with Microsoft. I have been taking this course (in spite of already knowing R, to get a sense of how good it is) because the reviews that this course is getting are spectacular.

The Analytics Edge – MOOC by MIT

R Programming MOOC by Johns Hopkins University

Alternatively, if you’d like to just go through the course videos on YouTube:
Week 1
Week 2
Week 3
Week 4

The Art of R Programming

The Art of R Programming

Excerpt from the blog PROGRAMMINGR

The Art of R Programming is a must read for all intermediate level R programmers. It covers nearly every method of performance enhancement available and provides a review of key fundamentals that may have been forgotten or missed.

One point of note, this text focuses almost solely on programming – the statistical examples are a means to an end, not an end themselves. For that reason, this book is recommended for those seeking to improve the efficiency of their programming rather than their statistical acumen.

R for Economists
This page consists of a useful range of links and material for economists to leverage the full potential of R