Re: [R] elegant solution to transform vector into percentages?

From: jim holtman <jholtman_at_gmail.com>
Date: Wed 27 Jul 2005 - 05:59:23 EST

use 'cut':

> store<-c(1,1.4,3,1.1,0.3,0.6,4,5)
> x.1 <- cut(store, breaks=c(-Inf,.8,1.2,Inf))
> table(x.1)/length(x.1)*100

x.1
(-Inf,0.8] (0.8,1.2] (1.2,Inf]

        25 25 50
>

On 7/26/05, jhainm@fas.harvard.edu <jhainm@fas.harvard.edu> wrote:
> Hi,
>
> I am looking for an elegant way to transform a vector into percentages of values
> that meet certain criteria.
>
> store<-c(1,1.4,3,1.1,0.3,0.6,4,5)
>
> # now I want to get the precentages of values
> # that fall into the categories <=M , >M & <=N , >N
> # let
> M <-.8
> N <- 1.2
> # In my real example I have many more of these cutoff-points
>
> # What I did is:
>
> out <- matrix(NA,1,3)
>
> out[1,1] <- ( (sum(store<=M )) /length(store) )*100
> out[1,2] <- ( (sum(store> M & store<= N )) /length(store) )*100
> out[1,3] <- ( (sum(store> N )) /length(store) )*100
>
> colnames(out)<-c("percent<=M","percent>M & <=N","percent>N")
> out
>
> But this gets very tedious if I have many cutoff-points. Does anybody know a
> more elegant way to do this task?
>
> Thanks so much.
>
> Cheers,
> Jens
>
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>

-- 
Jim Holtman

What the problem you are trying to solve?

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Received on Wed Jul 27 06:08:35 2005

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