On Thu, 23 Jul 2009 ted.hard...@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
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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