[R] simple data manipulation question

[Felipe Carrillo]

Or like this:
d = data.frame(gender=c("m","f","unkown"), x=rnorm(300))
  ddply(d,"gender",summarise,mean=mean(x))

Felipe D. Carrillo  
Supervisory Fishery Biologist  
Department of the Interior  
US Fish & Wildlife Service  
California, USA


--- On Thu, 12/10/09, smu <ml at z107.de> wrote:

> From: smu <ml at z107.de>
> Subject: Re: [R] simple data manipulation question
> To: "dolar" <nyetlin at gmail.com>
> Cc: r-help at r-project.org
> Date: Thursday, December 10, 2009, 1:45 AM
> for example:
> 
> > d = data.frame(gender=c("m","f","unkown"),
> x=rnorm(300))
> > tapply(d$x,d$gender,mean)
>            f 
>            m   
>     unkown 
> 0.0787628409  0.0940534765 -0.0005323276 
> 
> regards,
>  stefan
> 
> 
> On Wed, Dec 09, 2009 at 04:50:37PM -0800, dolar wrote:
> > 
> > Hi there
> > 
> > I have a dataframe of a whole lot of variables
> > 
> > lets say, one of my variables is gender
> > how do I simply get an average of all other variables
> by gender?
> > -- 
> > View this message in context: http://n4.nabble.com/simple-data-manipulation-question-tp956600p956600.html
> > Sent from the R help mailing list archive at
> Nabble.com.
> > 
> > ______________________________________________
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> > and provide commented, minimal, self-contained,
> reproducible code.
> >
> 
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
>