[R] Random # generator accuracy

[(Ted Harding)]

On 23-Jul-09 22:16:39, Thomas Lumley wrote:
> On Thu, 23 Jul 2009 Ted.Harding at manchester.ac.uk wrote:
> 
>> The general problem, of sampling without replacement in such a way
>> that for each item the probability that it is included in the sample
>> is proportional to a pre-assigned weight ("sampling with probability
>> proportional to size") is quite tricky and, for certain choices
>> of weights, impossible. For a glimpse of what's inside the can of
>> worms, have a look at the reference manual for the 'sampfling'
>> package, in particular the function samprop():
>>
> 
> The 'sampling' package also provides a nice selection of ways to draw
> PPS samples without replacement.
> 
>     -thomas

Thanks, Thomas. There is of course also the package 'pps'.
Ted.

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Date: 24-Jul-09                                       Time: 00:00:35
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