[R] select cases

[Achim Zeileis]

On Tue, 19 Apr 2005 16:18:14 +0200 Faouzi LYAZRHI wrote:

> Hi,
> I would like to select a few cases (for example cases corresponding to
> sex=male) to make summary for another variable.

Look at ?tapply. E.g.
  tapply(x, group, summary)
Z

> How can I do this.
> Thanks for your help
> Fawtzy
> 
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