# [R] linear correlation?

dechao wang dechwang at yahoo.co.uk
Thu Mar 7 11:33:41 CET 2002

```Hi, I have checked statistic textbooks about
correlations, but I am still not sure the correlation
analysis with different units, for example,

x1<-c(1,  2,  3,   100, 200, 300)
x2<-c(1.1,2.8,3.3, 108, 209, 303)
the unit of the first 3 numbers is cm
the unit of the last 3 numbers is kg

cor(x1,x2)=0.999655

Can I explain the correlation coefficient as normal in
which all numbers have the same unit?

Secondly, if keep the three large numbers unchanged,
just change the three small numbers, the coefficient
changes little, this means that the variation of three
small numbers is hidden by the three larger numbers.
Is there any solution in R to solve this issue?

Thanks,

Dechao

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