Have a look at ?aggregate or the doBy library. They may be what you want. --- Antje <[EMAIL PROTECTED]> wrote:
> Hello, > > I have a quite simple question, I guess. I have a > data frame and I would like > to process the data in several ways. > The processing is dependent on grouping (factors) > and the parameter itself. > Meaning for parameter1 in the df, I would like to > calculate the mean and sd > when grouping by factor1. But parameter2 might be > different. I thought of a > structure like this: > > group1 > param1 (mean, sd) > param2 (sum) > > group2 > param1 (mean, sd, median) > param2 (mean, sd) > > I'm not sure how to build up this "processing info" > structure. (The processing > itself will be later based on this structure). > Would you use a list? (matrix and vector are not so > flexible for different > length...) > > Can anybody help m with this? > > Antje > > ______________________________________________ > 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.
