Not really a SAS question. If you type "R" (capital r) in Google, you'll get their website http://www.r-project.org/. The faq explains what R is. Basically, it's a statistical programming language. It's more flexible but more complex and harder to learn and to use than statistical packages like SAS, SPSS, Stata. On the other hand, there are a lot of cutting edge techniques available on R that aren't available anywhere else. It's a good option if you want to experiment with new techniques, develop your own, or if you're on a low budget.

See http://www.ats.ucla.edu/stat/technicalreports/ for a second opinion.

Good luck, John Hendrickx

On 7 sep, 07:50, zencaroline <zencarol...@gmail.com> wrote: > Hello, > > At your possible convenience, might any expert please kindly answer > my equestions? Thank you very much. > I am suggested to use "R". > > 1) What is "R"? > > 2) Is it difficult to learn "R"? > > Thank you very much. > > Please take care > > Caroline