R is a statistical computing package that is available via an open source license. R (R Core Team, 2019) may be downloaded from http://www.R-project.org.
The add-on R Commander provides new users with a graphical interface that makes using R far more intuitive.
R Commander (Fox and Bouchet-Valat 2019) may be downloaded from this site:
There are also R Commander plug-ins that are used in the examples:
There are a number of excellent resources online to help you learn to use R and R Commander. Here is a short list: