Hi,
The documentation for scale() states:"If center is TRUE then centering is
done by subtracting the column means (omitting NAs) of x from their
corresponding columns". But it seems that R is subtracting something else
instead of the column mean:
> x=c(2,4,3,4,5)
> mean(x)
[1] 3.6
> x-mean(x)
[1] -1.6 0.4 -0.6 0.4 1.4
> scale(x)
[,1]
[1,] -1.4032928
[2,] 0.3508232
[3,] -0.5262348
[4,] 0.3508232
[5,] 1.2278812
attr(,"scaled:center")
[1] 3.6
attr(,"scaled:scale")
[1] 1.140175
Notice that -1.4 is not the same as -1.6, and 1.2 is not the same as 1.4,
etc. Does anyone know what exactly is scale() doing if it is not subtracting
the column mean? Thanks.
--
Tom
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