If you want to centre the data, but not scale as well, turn off scale: unlist(tapply(x, group, scale, scale=FALSE))
HTH, Simon. 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) > unsplit(lapply(split(x,group),scale),group) > > I would appreciate your help. > > Ashraf > -----------------______________________________________ > 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:[EMAIL PROTECTED]> [EMAIL PROTECTED] > Web:http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > > -- Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat. Centre for Resource and Environmental Studies The Australian National University Canberra ACT 0200 Australia T: +61 2 6125 7800 email: Simon.Blomberg_at_anu.edu.au F: +61 2 6125 0757 CRICOS Provider # 00120C ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
