Added articles written to support students in R Programming -- strategy for coding the assignments, grading the SHA-1 has code, Data frame as a list, and 3 articles discussing R and commercial stats packages.

Author: lgreski

rprog.md

@@ -6,22 +6,31 @@ permalink: /rprog/
 
 ## Programming Assignments
 
+- [Strategy for Coding the Programming Assignments](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/makeItRun.md)
 - [Tutorial for those struggling with Programming Assignment 1](https://github.com/derekfranks/practice_assignment)  
 - [Tutorial for those struggling with Programming Assignment 2](https://github.com/DanieleP/PA2-clarifying_instructions)
 - [Tutorial for those struggling with Programming Assignment 3](https://github.com/DanieleP/PA3-tutorial)
 - [PA1-test: `testthat`, Unit Tests for Programming Assignment 1](https://github.com/cbryant1000/pa1test)
 - [PA3-test: `testthat`, Unit Tests for Programming Assignment 3](https://github.com/cbryant1000/pa3test)
 - [Alternative submit script for Programming Assignment 1 that makes submitting more convenient by allowing selection of multiple parts plus prompting if user wants to submit another part before exiting](https://github.com/rchampoux/coursera/blob/master/rprog-scripts-submitscript1.R)
+- [Grading the SHA-1 Hash Code](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/rprog-gradeSHA1hash.md)
 
 
 ## R Language
 
 - [Some notes on the R Language](http://lopezrj.github.io)
+- [A Data Frame is Also a List](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/dataFrameAsList.md)
 
 ## R language cheatsheet
 
 - [R cheatsheet covering all lectures](https://github.com/startupjing/Tech_Notes/blob/master/R/R_language.md)
 
+## R and Commercial Statistics Packages
+
+- [Commercial Statistics Packages: An Historical Perspective](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/statsPackagesHistory.md)
+- [Why is R More Difficult than SAS?](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/whyIsRHarderThanSAS.md)
+- [SAS Experience: impediment to learning R?](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/exampleSortRvsSAS.md)
+
 ## Comprehensive Notes
 
 - Complete notes for [R Programming](http://sux13.github.io/DataScienceSpCourseNotes/)