search for: tt15738907

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2008 Mar 30
2
Problem: using cor.test with by( )
Hello everyone, I'm a new R user switching from SAS and JMP. In the first few days, I have been trying to do a fairly simple task but yet found no success. I've checked the help archive as well as few R textbooks but didn't seem to find the answer. So, please help me if you can. Basically, I want to calculate the correlation between variable A and B for every subject in my