Hi Karin, I'm not sure I understand... Is this what you want ?
d$y - mean(d$y)/sd(d$y) 2009/4/15 Karin Lagesen <karin...@ifi.uio.no> > > Hi! > > First, pardon me if this is a faq. I think I should be using some sort > of apply, but I am not managing to figure those out. > > I have a data frame similar to this: > > > d <- data.frame(x = LETTERS[1:5], y = rnorm(5), z = rnorm(5)) > > d > x y z > 1 A 0.1605464 -0.2719820 > 2 B -0.9258660 1.2623117 > 3 C -0.3602656 1.5470351 > 4 D 1.2621797 1.2996500 > 5 E 0.6021728 0.5027095 > > > > >From this I want to get a new data frame which contains the z scores > based on the values found in each row. For instance for element [C,y], > I would like to calculate (-0.3602656 - mean(column y)/stddev(column > y)). > > Thanks! > -- > Karin Lagesen, Ph.D. > karin.lage...@medisin.uio.no > http://folk.uio.no/karinlag > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
