To: Shane Carey
> Cc: "r-help@r-project.org"
> Sent: Tuesday, June 25, 2013 8:50 AM
> Subject: Re: [R] Calculate geometric mean with tapply
>
> Hm
>
>
> > -Original Message-
> > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> &
May be this also works:
exp(mean(log(abs(x
#[1] 0.4985282
A.K.
- Original Message -
From: PIKAL Petr
To: Shane Carey
Cc: "r-help@r-project.org"
Sent: Tuesday, June 25, 2013 8:50 AM
Subject: Re: [R] Calculate geometric mean with tapply
Hm
> -Original Messag
g] On Behalf Of Shane Carey
> > Sent: Tuesday, June 25, 2013 1:25 PM
> > To: Rui Barradas
> > Cc: r-help@r-project.org
> > Subject: Re: [R] Calculate geometric mean with tapply
> >
> > Thanks for your help, put I've tried that and it still gives me back
Hm
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of Shane Carey
> Sent: Tuesday, June 25, 2013 1:25 PM
> To: Rui Barradas
> Cc: r-help@r-project.org
> Subject: Re: [R] Calculate geometric mean with tapply
Thanks for your help, put I've tried that and it still gives me back the
mean when I use it within tapply for some reason
On Tue, Jun 25, 2013 at 12:17 PM, Rui Barradas wrote:
> Hello,
>
> You can write a function gmean and tapply it to your data.
>
>
> gmean <- function(x, na.rm = FALSE){
>
Hello,
You can write a function gmean and tapply it to your data.
gmean <- function(x, na.rm = FALSE){
if(na.rm) x <- x[!is.na(x)]
n <- length(x)
prod(x)^(1/n)
}
tapply(data$value, data$group, gmean)
Hope this helps,
Rui Barradas
Em 25-06-2013 11:58, Shane Carey esc
Hi,
I am trying to calculate the geometric mean with tapply. This is the
formula I am using:
exp(tapply(log(data$value), data$group, mean))
However, it returns the arithmetic mean. Any ideas?
Thanks
--
Shane
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