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I am writing a simple R program to execute a t-test repeatedly on data contained in a data frame. My data looks like this: Category Value1 Value2 1 .5 .8 1 .3 .9 . . . . . . . . . 2

Mark, Henrique, and Jorge, Thank you all very much for your replies. I'm really impressed by your knowledge of R: I'd never even heard of of some of these functions (especially split() and unlist().) I went with the Henrique-Mark solution and it is working fine. Thanks again! David [[alternative HTML version deleted]]