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st: Different ways of finding the mean of survey data


From   <I.Roland@lse.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Different ways of finding the mean of survey data
Date   Mon, 2 Dec 2013 12:08:42 +0000

Hi Stata users,

I am working with survey data and at this stage I just would like to produce mean and median stats.

I have noticed a difference in means for variable x when using either of the following command sequences:

svyset id [pweight=pweight], strata(strata)

followed by (1) or (2):

(1) mean x [pweight=pweight]
(2) svy: mean x

I initially used (2) but then I found the following advice for computing the median in the FAQs:

_pctile x [pweight=pweight], p(50)

gen median_x=r(r1)

This led me to try (1) to verify that I get the same result for the mean as in (2) - and I do not. Then: if "svy: median x" existed, it would give a different result. Why would this be a valid method for computing the median if (1) is not a valid method for computing the mean?

Any help in clarifying this is very much appreciated!
Isabelle

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