On Fri, 24 Jun 2011, wang peter wrote:
aa file is： x 1 NA 2 y 1 NA 3and r program isaa<-read.table("aa",row.names=1) bb<-cor(t(aa),method = "pearson",use="pairwise.complete.obs") bbx y x 1 1 y 1 1 i am confused why the pearson correlation coefficients between x and y is 1
You have two paired observations. Plot the points and draw the regression line. Every point is on the line (there are only two points). The correlation has to be 1.
Mike
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