I suspect what is being said is to compare existing stat textbook but more likely existing stat result of a web site using r. Not to run r but run these and compare the result.

I did the same to r using ibm spss. Not that I trust that more. Just to make sure when newly program you have used the right parameters. If they compare, you finish learning and switch over. A cautious approach when your job is at stake.

The entire point of my comment was that the initial commenter wasn't necessarily saying R is a better language. Somehow you've interpreted my comment as "R is a better language" which is quite far from what it says.