- A tutorial from the developer of plyr - http://plyr.had.co.nz/09-user/
- A nice reshape tutorial http://www.slideshare.net/jeffreybreen/reshaping-data-in-r
- A good plyr primer - http://www.r-bloggers.com/a-quick-primer-on-split-apply-combine-problems/
Source from: http://jtleek.com/modules/03_GettingData/03_04_reshapingData/#1
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