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Message-ID: <47C1151A-BE59-4EA3-B5C7-B0A700638C16@gmail.com> Date: 2011-01-31T20:42:27Z From: moleps Subject: p value for joint probability Dear all, Given rr<-data.frame(r1<-rnorm(1000,10,5),r2<-rnorm(1000,220,5)) How can I add a column (rr$p) for the joint probability of each r1 & r2 pair? I know how to add the column.. I just dont know how to compute the p value for joint probabilities given the two samples. //M