Quick-R allows you to quickly put R to use for simple tasks.
If you are already familiar with the statistical methods covered or if you are coming from a different stats software it is a great and easily accessible reference. The website's author also published "R in Action" which might also be a helpful resource for beginners
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Everything on the website is for free and it covers quite a lot of what people new to R might want to do at the start. At least if they are interested mainly in statistical analysis (and less in R programming).
Pro Allows for a quick start
With hands-on examples and code snippets it allows people to get started quickly.
Pro Good reference for transition from other statistical software
If people know the basics or come from different applications Quick-R is especially helpful, because people that know what they are looking for, will find easy guides on how to do certain things in R.
Con Less helpful for programming
Quick-R is a nice resource if you want to learn quickly how to do basic statistic analysis. However there is little information on programming or basic principles of R as a programming language.