A nice way to obtain summary for data is to use summary.formula in Hmisc 
package.

 Justin BEM
BP 1917 Yaoundé
Tél (237) 76043774




________________________________
De : Jim Lemon <jim@bitwrit.com.au>
À : effeesse <scarpino86@gmail.com>
Cc : r-help@r-project.org
Envoyé le : Lun 13 décembre 2010, 11h 23min 15s
Objet : Re: [R] descriptive statistics

On 12/13/2010 09:04 PM, effeesse wrote:
>
> Hi. In a data set I have a variable that takes values from 1 to 14. For each
> subgroup of values of this variable, I would like to obtain some descriptive
> statistics of other variables present in the data set. I've been trying with
> a "for" loop but I couldn't get nothing. Could you please suggest me some
> lines?

Hi effeesse,
Sure:

testmat<-data.frame(sample(1:14,50,TRUE),rnorm(50),runif(50))
by(testmat[,-1],testmat[,1],mean)

Jim

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