[R] simple help request

[John Kane]

?aggregate  

Something like this should do it.

aggregate(xx[,1], list(xx[,2], median)


--- On Fri, 8/1/08, stephen sefick <ssefick at gmail.com> wrote:

> From: stephen sefick <ssefick at gmail.com>
> Subject: Re: [R] simple help request
> To: "Lotta R" <lottajane at gmail.com>
> Cc: r-help at r-project.org
> Received: Friday, August 1, 2008, 2:36 PM
> # I am sure there is a better way than this
> a <- c(1,6,10,11,3,5,10)
> group <- c(5,5,5,5,9,9,9)
> my.df <- cbind(a,group)
> a.5 <- subset(my.df, group==5)
> median(a.5[,1])
> a.9 <- subset(my.df, group==9)
> median(a.9[,1])
> 
> # MASS 4 is a good book
> 
> On Fri, Aug 1, 2008 at 1:30 PM, Lotta R
> <lottajane at gmail.com> wrote:
> > Hi all,
> >
> > I have data that looks like
> >
> > number|grouping
> >
> >
> > I would like to preform stats for each grouping
> >
> > so
> >
> > 1|5
> > 6|5
> > 10|5
> > 11|5
> > 3|9
> > 5|9
> > 10|9
> >
> > Say I would like to take the median for above, I
> should be returned 2 lines,
> > one for group #5 and one for group #9
> >
> > Does this make sense?
> >
> > I am sorry for the basic question, can someone give me
> the name of a good
> > book as well?
> >
> > Thanks,
> > Lotta
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at 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.
> >
> 
> 
> 
> -- 
> Let's not spend our time and resources thinking about
> things that are
> so little or so large that all they really do for us is
> puff us up and
> make us feel like gods. We are mammals, and have not
> exhausted the
> annoying little problems of being mammals.
> 
> 	-K. Mullis
> 
> ______________________________________________
> R-help at 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.


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