Very easy-to-follow and concise course on R Programming, take me around a day to view all the lecture videos and practice in R while following the videos (I liked Dr. Roger Peng's pace as well as the selective inclusions of R features in the course materials, most of the book on R out there try to cover too much and only ends up making the books more like a desktop reference or instruction manual for R). I particularly likes the parts covering the explanation on the usage of lapply, sapply, apply, mapply, sapply and split, as well as the parts covering the subsetting of vector, list, matrix, and data frame, which in the past it is a bit confusing for me
https://class.coursera.org/rprog-013
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