Re: Calculation done on rows for select columns

["Francisco J. Zagmutt" <gerifalte28@hotmail.com>]

?rowMeans


> From: "Overstreet, Jason (FL51)" <Jason.Overstreet@honeywell.com>
> To: s-news@lists.biostat.wustl.edu
> Subject: [S] Calculation done on rows for select columns
> Date: Mon, 23 Jan 2006 10:56:18 -0700
>
> I have a data frame as shown below called xy:
>
> > xy
>   x.1 x.2 x.3 y.1 y.2 y.3
> 1   1   5   9   2  10  18
> 2   2   6  10   4  12  20
> 3   3   7  11   6  14  22
> 4   4   8  12   8  16  24
> >
>
> I was wondering what would be an easy way to have the mean and variance
> calculated and stored as follows:
> >    xy
>
>         x.1     x.2     x.3     mean.x  var.x   y.1     y.2     y.3
> mean.y  var.y
> 1       1       5       9       5               16      2       10      18
> 10              64
> 2       2       6       10      6               16      4       12      20
> 12              64
> 3       3       7       11      7               16      6       14      22
> 14              64
> 4       4       8       12      8               16      8       16      24
> 16              64
> >
>
>
>
> Jason Overstreet
> Statistician
> Honeywell DSES
> (727) 539-3964