Robert Manhen reads your mind. He published a free manuscript, which later became a Springer book called R for SAS and SPSS users. It is really written for people who know SAS or SPSS, but would like to learn R. Fortunately, he gives examples of how to do things in all three languages. It will also work well if you know R and want to return to SAS. It started as a free manuscript, and then Springer helped him push it into a complete book. Here are some links:
In addition, here is a document on the topic of back and forth data transfer between R and SAS .
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