In addition to R For Dummies, there are many online resources for the aspiring or experienced R programmer. They'll help you find answers or learn valuable tips and tricks. (Or, they're just fun!)
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Cookbook for R
The goal of the Cookbook for R is to provide solutions to common tasks and problems in analyzing data.
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Mailing lists
Specialized mailing lists can help you find answers for your field of interest.
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R podcast
Enjoy some R talk while you drive to work with the R podcast!
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R Seek
R Seek is a simple search tool that accesses several online resources with one command.
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The R Inferno
Patrick Burns has created a tutorial, The R Inferno, in the style of Dante's Inferno: "Abandon all hope, ye who enter here!" The pdf file can be found here: http://www.burns-stat.com/pages/Tutor/R_inferno.pdf.
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The R Journal
The R Journal is the open access, refereed journal of the R project for statistical computing.
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R-bloggers
Hundreds of blogs on R are linked and searched on this the R-bloggers web page.
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RTips
In RTips, dozens of tweaks, tips, and timesavers are lovingly compiled from years of experience on the R mailing list.
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Twitter
R is a very short name, so that leaves 139 characters on Twitter for the latest nugget (or link to cat videos).
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Revolutions
The Revolutions blog captures the latest trends in R programming. It's sponsored by Revolution Analytics.