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I have a very simple problem and am completely missing the solution. I have two character variables (character ID's from two datasets) Data set 'b' is data set 'a' with one more subject added. How do I find out which is the added subject? I have tried duplicated and unique without much success. I can find all the duplicated ID's but how do I extract the new

Hi there, I would like some advice, not so much about how to use R, but about software that I need to complement R. I've rooted around in the FAQ's and done a few searches on this mailing list but haven't quite found the perspective I need. I am an experienced data analyst in my field (forest ecology and ecological monitoring) but new to R. I am a long time user of SPSS and have