Hello, I've got a problem to find an effective calculation. There are x,y data and I want to build classes for the x values. For each class then I want to calculate the median, N%-Quantiles, outliers, etc. for the corresponding y values and store all in a vector or matrix. Is there a direct possibility to do this without storing to much temporary data? Thank's in advance, Michael Hecht ------------------------------------------------- | Dipl.-Math. Michael Hecht | 66748 Dillingen / Germany | E-Mail : mailto:michael.hecht at dillinger.de
Median in Classes
2 messages · Hecht Michael, F+E/ST, Dimitris Rizopoulos
you could try something like this: dat <- data.frame(x=rep(1:4, each=25), y=rnorm(100)) tapply(dat$y, dat$x, summary) I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/336899 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Hecht Michael, F+E/ST" <Michael.Hecht at dillinger.biz> To: "'r-help at lists.R-project.org'" <r-help at stat.math.ethz.ch> Sent: Monday, March 21, 2005 10:59 AM Subject: [R] Median in Classes
Hello, I've got a problem to find an effective calculation. There are x,y data and I want to build classes for the x values. For each class then I want to calculate the median, N%-Quantiles, outliers, etc. for the corresponding y values and store all in a vector or matrix. Is there a direct possibility to do this without storing to much temporary data? Thank's in advance, Michael Hecht ------------------------------------------------- | Dipl.-Math. Michael Hecht | 66748 Dillingen / Germany | E-Mail : mailto:michael.hecht at dillinger.de
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