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st: Survey standard errors of grouped data proportions


From   Philip Burgess <filip.liljeholm@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Survey standard errors of grouped data proportions
Date   Mon, 16 Dec 2013 16:57:40 +1000

I am using Stata 13.1 SE on a Windows 7 platform.


I have complex survey design data set, with replicate weights, etc and have
successfully svyset using the statement


svyset   _n [pweight=3Dwgt], vce(linearized) singleunit(missing)


I have two variables of interest, patient visits (continuous) and patient
severity group (5 mutually exclusive categories).


To estimate the average number of patient visits, I simply run:

svy: mean visits, over(group)

This gives weighted means and appropriate standard errors (and thus the CI)



What I next want to estimate in the relative proportion of all patient
visits in each of the five groups.

For example, the most severe patient group accounts for approximately 60%
of all patient visits.

I can estimate the overall total of patient visits per group using the
command:

svy: total visits, over(group)

and from that can work out the point estimate of the relative proportion
for each of the 5 groups.

But I cannot figure out how to get the SE of the relative proportion.


This is probably incredibly simple but I have had no luck searching the
FAQ, the manual or the list archives.

Thanks;

Philip
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