tmagney (1/9/2017)
Came to this article because of the subject line and hoping to learn more about what R is and how to use it. But with only a small snippet of code being shown, I didn't learn anything except that there is some function called chi-squared. Perhaps you could link to some background reference material with more info about R itself?
A shame that this wasn't what you were looking for. For an intro to R, perhaps a quick Google for things like this:
Statistics + R: https://cran.r-project.org/web/packages/IPSUR/vignettes/IPSUR.pdf
Basic visualisation in R: http://www.computerworld.com/article/2497304/business-intelligence-beginner-s-guide-to-r-painless-data-visualization.html
Cheers,
Nick