> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of P Ehlers > Sent: Wednesday, March 02, 2011 10:29 PM > To: LouiseS > Cc: r-help@r-project.org > Subject: Re: [R] Creating a weighted sample - Help > > LouiseS wrote: > > Hi > > > > I'm new to R and most things I want to do I can do but I'm stuck on how > to > > weight a sample. I have had a look through the post but I can't find > > anything that addresses my specific problem. I am wanting to scale up a > > sample which has been taken based on a single variable (perf) which has > 4 > > attributes H,I, J and K. The make up of the sample is shown below:- > > > > Perf Factored Count (A) Raw Count (B) Factor (A/B) > > H 5,945 2,924 > 2.033174 > > I 1,305 2,436 > 0.535714 > > J 2,000 2,092 > 0.956023 > > K 750 1,225 > 0.612245 > > > > > > I then want to produce all further analysis based on this factored > sample. > > I can produce a weighted sample in SAS using the weight function which I > > have shown below > > > > wt=0; > > if perf='H' then wt=2.033174; > > if perf='I ' then wt=0.535714; > > if perf='J ' then wt=0.956023; > > if perf='K ' then wt=0.612245; > > > > proc freq data=DD.new; > > tables resdstat; > > weight wt; > > run; > > > > Does anyone know how to reproduce this in R? > > I don't know what you mean by "all further analysis", > but if you want weighted mean, variance, quantile, have > a look at ?wtd.mean in the Hmisc package. Just use your > A/B values in a weights vector. > > Peter Ehlers >
You haven't told us how you obtained these data that you want to weight, but if you used some kind of non-SRS sampling plan (e.g. stratified, or cluster sample) then you should look at the survey package. Dan Daniel Nordlund Bothell, WA USA ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
