You can use summaryBy() in the doBy package: summaryBy(y+x~group, data=mydata, FUN=c(mean,sd)) Søren
________________________________ Fra: r-help-boun...@r-project.org på vegne af Jörg Groß Sendt: sø 11-01-2009 22:38 Til: r-help@r-project.org Emne: [R] summary with variance / sd Hi, I have a data frame and would like to have summary statistics for grouped data. With summary() I get the central tendencies for the overall data. How can I get descriptive statistics with variances and standard deviations? for example my data.frame: group x y exp 2 4 exp 3 5 exp 2 4 control 1 2 control 2 3 control 1 2 now I want tables with summary statistics (variances included) for each group. Is there an easy way to get this? ______________________________________________ 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. ______________________________________________ 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.
