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
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