Dear Mr Winsemius
I am sorry to have offended any of you by the mistakes i made. The package i
loaded is sampling and there was an unwanted comma between size c(20, )and the
bracket. What i wanted was to calculate the sum of H in a sample not in the
original dataframe. If i do
sum(H) i get the sum value of H's in the original dataframe.
Load package sampling
H <- matrix(rnorm(100, mean=50000, sd=5000))
sampleframe=data.frame(type=c(rep("H",100)),value=c(H))
sampleframe
sum(H)
str=strata(sampleframe,c("type"),size=c(20), method="srswor")
sample.strat<-getdata(sampleframe,str)
sample.strat
Thanks for the input. Once again sorry for wasting your time.
Best Regards
--- On Fri, 2/10/09, David Winsemius <dwinsem...@comcast.net> wrote:
From: David Winsemius <dwinsem...@comcast.net>
Subject: Re: [R] How to use Subpopulation data?
To: "KABELI MEFANE" <kabelimef...@yahoo.co.uk>
Cc: R-help@r-project.org
Date: Friday, 2 October, 2009, 3:38 PM
On Oct 1, 2009, at 6:06 AM, KABELI MEFANE wrote:
> Dear Helpers
>
> I have a sample frame and i have sampled from it using three methods and now
> i want to calculate the statistics but i only get the population parameters.
>
> H <- matrix(rnorm(100, mean=50000, sd=5000))
> sampleframe=data.frame(type=c(rep("H",100)),value=c(H))
> sampleframe
>
> str=strata(sampleframe,c("type"),size=c(20,), method="srswor")
> sample.strat<-getdata(sampleframe,str)
> sample.strat
If you want the number of rows in sample.strat then length(H) is the wrong
approach since that is the original (unsampled) object.
> length(H)
> i get:
>
> length(H)
> [1] 100
>
> Desire to get:
> length(H)
> [1] 20
I cannot tell what packages you have loaded and strata is not in the sampling
package which I guessed (wrongly) was where you were getting "getdata". When
you post code you should precede that code with calls that load any non-base
packages.
In later posting you ask for ways to calculate "the sum" but you do not say
what it is that you want the sum of.... . Our abilities to read minds is
extremely limited.
--David Winsemius
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