When I started learning R, as a SAS and SPSS user, I found it quite alien. SAS and SPSS are structured very similarly, and I wasted a lot of time trying to get R to work in their style. As I learned, I wrote extensive notes to myself. I eventually posted them online as R for SAS and SPSS Users. To my surprise, a counter showed that those notes were soon getting 10,000 hits a month. Although I’m no longer maintaining them, this early version of my book is still available here. The book version of R for SAS and SPSS Users is a greatly expanded version of this document, and many of the examples are now available on this web site. Have fun learning R!