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...#but this fills each column in the matrix with the same exact t value. #Can someone tell me how to write the code to perform each pair of t tests? I think i am missing something in my loop Thanks -- View this message in context: http://r.789695.n4.nabble.com/Performing-repeated-T-tests-in-R-tp4571860p4571860.html Sent from the R help mailing list archive at Nabble.com.