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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