A Complete Tutorial on Tree Based Modeling from Scratch (in R & Python)
Data Camp
https://www.datacamp.com/
Resource for Learning R and Python: A (very) short introduction to R
https://cran.r-project.org/doc/contrib/Torfs+Brauer-Short-R-Intro.pdf
Introduction to R Studio
http://dss.princeton.edu/training/RStudio101.pdf
R4stats.com
The examples section of this site (http://r4stats.com/examples/) provides a set of programs showing how to do the same tasks in R, SAS, SPSS and Stata.
https://www.dataquest.io/
Resource for Learning R
Try R
https://www.codeschool.com/courses/try-r
Quick-R
http://statmethods.net/about/sitemap.html
R Documentation Search
https://www.rdocumentation.org/
R Fiddle
Udacity
https://www.udacity.com
Resource for learning R and Python
Coursera
https://www.coursera.org/
Resource for Learning R and Python