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R is a fantastic language for statistical programming, but making the jump from point and click interfaces to . R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS. To . This section describes basic (and not so basic) statistics. It includes code for obtaining descriptive statistics, frequency count, crosstabulations, and correlations. R is a free, open source software program for statistical analysis, based on the S language. What is RStudio? RStudio is a free, open source IDE ( . 1.1 R and RStudio.