[R] Scalling/Centering the Data by an Index
blomsp at ozemail.com.au
Thu Jul 13 08:54:31 CEST 2006
If you want to centre the data, but not scale as well, turn off scale:
unlist(tapply(x, group, scale, scale=FALSE))
Ashraf Chaudhary wrote:
> Dear All:
> I would like to center the data in 'x' by 'group'. The following code scale
> the data and I have not been able to figure out how to change it so I get
> the centered data.
> x <- c(1, 2, 3, 4, 5, 6, 7, 8)
> group <- c(1,1,1,2,2,2,2,2)
> I would appreciate your help.
> M. Ashraf Chaudhary, Ph.D.
> Associate Scientist/Biostatistician
> Department of International Health
> Johns Hopkins Bloomberg School of Public Health
> 615 N. Wolfe St. Room W5506
> Baltimore MD 21205-2179
> (410) 502-0741/fax: (410) 502-6733
> <mailto:mchaudha at jhsph.edu> mchaudha at jhsph.edu
> [[alternative HTML version deleted]]
> R-help at stat.math.ethz.ch mailing list
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Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat.
Centre for Resource and Environmental Studies
The Australian National University
Canberra ACT 0200
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