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RE: st: Multistage sampling svyset


From   <James.Valcour@med.mun.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Multistage sampling svyset
Date   Thu, 10 Jun 2010 17:05:10 -0230

Hi Michael,

Sorry my bad.  Whenever I estimate the proportion (using svy: prop) the
confidence intervals around the estimates are not created regardless of
the ailment.

I did a double check and there are not missing values in any communities
with respect to the ailments.  Some communities with a low sampling
number have a prevalence of 0%.  All ailments are coded as dichotomous.

I haven't experimented with the -singleunit()- option yet.  I will try
that.

Thanks,
James

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael I.
Lichter
Sent: June 10, 2010 4:39 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Multistage sampling svyset

James,

You said you had this problem "when I'm trying to estimate the
proportion of study with CERTAIN ailments." [my emphasis] Does that mean
you don't have this problem with other ailments?

You said 'The message that is given is "Note: missing standard errors
because of stratum with single sampling unit."' Have you checked to be
sure that all strata (communities) have at least two non-missing
responses for each ailment? Have you experimented with the
-singleunit()- option to -svyset-?

Michael

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