helpers
I have tried doing everything i can but i think my problem may be solved by
even one command or statement. If i have a dataframe with variale name A,B,C
and i subset this dataframe, how do i retain the variable names to use in my
subset.
In short i need to forget about the original dataframe until after i have
finished with the subset, then also how do i call it back, may be by
sampleframe$type,.......sampleframe$value?
Thanks and i rest my case
--- On Thu, 1/10/09, KABELI MEFANE <kabelimef...@yahoo.co.uk> wrote:
From: KABELI MEFANE <kabelimef...@yahoo.co.uk>
Subject: Re: [R] How to use Subpopulation data?
To: "Peter Ehlers" <ehl...@ucalgary.ca>
Cc: R-help@r-project.org, "Bernardo Rangel Tura" <t...@centroin.com.br>
Date: Thursday, 1 October, 2009, 2:34 PM
Thanks
i was not aware of str, i have a very large code since i am new to r.
I forgot to mention that the package is sampling. Actually i have this
simulated code:
n <- c(100,400,1000,1500,2000)
x <- c(2,3,3,3,5)
y <- c(7,7,9,10,10)
s <- function(mn, mx, n) {sample(mn:mx, n, replace=TRUE)}
rating=unlist(mapply(s, x, y, n))
Hypermarket <- matrix(rnorm(100, mean=50000, sd=5000))
Supermarket <- matrix(rnorm(400, mean=34000, sd=3000))
Minimarket <- matrix(rnorm(1000, mean=10000,sd=2000))
Cornershop <- matrix(rnorm(1500, mean=2500, sd=500))
Spazashop <- matrix(rnorm(2000, mean=1000, sd=250))
dat=data.frame(type=c(rep("Hypermarket",100), rep("Supermarket",400),
rep("Minimarket",1000),rep("Cornershop",1500), rep("Spazashop",2000)),
value=c(Hypermarket, Supermarket, Minimarket, Cornershop,Spazashop))
##sample frame
sampleframe=data.frame(type=c(rep("Hypermarket",100), rep("Supermarket",400),
rep("Minimarket",1000),rep("Cornershop",1500), rep("Spazashop",2000)),
value=c(Hypermarket, Supermarket, Minimarket, Cornershop,Spazashop),
ratings =cbind(rating))
## package sampling
stra=strata(sampleframe,c("type","value","rating"),size=c(20,80,200,300,400),
method="srswor")
sample.strat<-getdata(sampleframe,stra)
sample.strat
now i want to find different estimates from sample.strat
Help appreciated.
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