Dear allstat,
I am working on a problem involved with comparing two population proportions
using two samples. The problem is that the samples were obtained using
stratified random sampling. So far i've been able to produce estimates,
complete with 95% CIs, of the population proportions by applying the stratum
weights to the estimated statum populations.
Comparing my estimates to see if there's any "significant difference"
between the two population proportions still eludes me, however. I know
formulae exist for comparing the difference between two populations when the
samples are random samples, but do any exist for the case when the samples
were drawn using stratified random sampling?
If anyone can point me in the right direction on how to this it would be
great.
Many thanks in advance,
Stephen Yeung
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Stephen Yeung
Statistician
National Pro-active Team
Counter Fraud Services
NHSScotland
Tel: 01506 705 236
Fax: 01506 465 182
Web: http://www.show.scot.nhs.uk/fiu
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