Re: [R] Is it the PPS samples i needed in R?

From: Thomas Lumley <>
Date: Tue 16 Jan 2007 - 18:57:13 GMT

On Fri, 12 Jan 2007, zhijie zhang wrote:

> Dear friends,
> I want to do a unequal probability sampling, that is, Probability
> Proportionate to size, Is it right for the following programs?
> Say my original dataset is:
> ID Population
> 1 100
> 2 200
> 3 300
> IF the population is large ,then the corresponding ID has the large
> Probability to be selected.
> sample(A$ID, size=2, replace = FALSE, prob = A$population)
> #suppose the dataset name is A.
> Is it the PPS samples i needed ?

No, this does not give PPS samples for size>1. The "pps" and "sampling" packages have code for PPS samples.

         -thomas mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Wed Jan 17 06:01:38 2007

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