The R Project for Statistical Computing is a free, open source statistical computing language that is popular among researchers in many fields.
The learning curve for true understanding is steep, but specific tasks (e.g., importing files from other statistical software) are often quite easy because of packages that can be created by anybody. R undergoes rapid development and improvement. Tutorials even a year old may be out of date.
NOTE: RStudio is currently in the process of changing names to Posit. Various tutorials may reference one or the other, but both are acceptable at this time.
NOTE: RStudio is now Posit (Both names are being used). The RStudio / Posit website undergoes frequent changes so the process of downloading RStudio will be slightly different. But, the links/buttons use the same names (and have blue backgrounds to stand out).
Instead of creating a "script" file with R code, and producing output in separate files, you can combine them. Also called "notebooks", there are several methods that allow you to combine code and text (using a markup language like Markdown).
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