Re: [R] Creating a weighted sample - Help

From: P Ehlers <ehlers_at_ucalgary.ca>
Date: Wed, 02 Mar 2011 22:28:42 -0800

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

>
> Thanks very much
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Creating-a-weighted-sample-Help-tp3331842p3331842.html
> Sent from the R help mailing list archive at Nabble.com.
>
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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. Received on Thu 03 Mar 2011 - 06:32:01 GMT

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