I assume that you are using package:sampling? (Perhaps it
wouldn't be too much trouble to include that information
with your query.)
Read ?strata and pay attention to the 'Value' section.
This will tell you that the function returns a variable
ID_unit - the identifier of the selected units
Use this to process your samples; e.g.
idx <- str$ID_unit
mysample <- sampleframe[idx,]
etc.
ps
Another way to see what's in 'str' is to use the str() *function*.
str(str)
And, as someone will surely mention, would you call your dog 'dog'?
I.e. bad choice of object name.
-Peter Ehlers
KABELI MEFANE wrote:
Thanks
i know, i was just simplying since i have a bigger set,
But the problem is not that.The problem is i have a sampled data and i need to use the results but when i only get the population results. How do i get the legnths,summary,etc of my sampled data not the population?
--- On Thu, 1/10/09, Bernardo Rangel Tura <t...@centroin.com.br> wrote:
From: Bernardo Rangel Tura <t...@centroin.com.br>
Subject: Re: [R] How to use Subpopulation data?
To: "KABELI MEFANE" <kabelimef...@yahoo.co.uk>
Cc: R-help@r-project.org
Date: Thursday, 1 October, 2009, 11:24 AM
On Thu, 2009-10-01 at 10:06 +0000, 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")
Try using
str=strata(sampleframe,c("type"),size=20, method="srswor")
or better
str <- strata(sampleframe,c("type"),size=20, method="srswor")
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and provide commented, minimal, self-contained, reproducible code.
