Re: [R] aggregate(), with multiple functions in FUN?

From: david f <3.14david_at_gmail.com>
Date: Sat, 17 May 2008 16:28:20 -0700 (PDT)

You might want to look at the summaryBy function in the doBy package

summaryBy(varname ~ zip, data=DATA,FUN=c(mean,median)

David Freedman

Mike ! wrote:
>
>
>
> I've got a data frame having numerical data by zip code:
>
> ZIP DATA
> 94111 12135.545
> 93105 321354.65654
> 94111 545.555
> 94706 558858.66
> ... ...
>
> I'm using this function to group records by ZIP and calculate the median
> of DATA:
>
> aggregate(d$DATA, list(Zip = d$ZIP), FUN=median, na.rm=T)
>
> but what I really want to do is to calculate several statistics (median,
> mean, etc.) for each group of records, so that I'll get a result organized
> like:
>
> Zip median(DATA) mean(DATA)
> 94706 565 555
> 94111 59585 66666
> 93105 595685 5555666
> ...
>
> I tried using FUN=funstofun(median,mean), but found that doesn't work in
> aggregate. Is there a straightforward way to do what I'm after (I'm
> pretty new to R)? thanks
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Received on Sat 17 May 2008 - 23:33:12 GMT

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