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RE: st: Different confidence intervals from proportions and tabulates (also in survey)


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Different confidence intervals from proportions and tabulates (also in survey)
Date   Mon, 30 Oct 2006 00:01:24 -0000

As before, your terminology of negative CIs is puzzling. 
An interval is a length; if the upper limit falls below 
the lower limit, then there is really is a bug. However, 
as before, I assume you are talking about negative lower limits 
(bounds). 

There is a no attachments rule on Statalist. (The FAQ explains.) 

The export to MS Excel is naturally independent of these issues
and your own choice. If you have Excel-specific problems that 
are also relevant to Statalist, others will advise. 

Nick 
n.j.cox@durham.ac.uk 

Jason Ferris
 
> Dear Jeff and Nick,
> Thanks for your replies.  I did not attach my dataset; 
> although I could
> attach the output of the -svy: prop and -svy: tab if you want.  I
> thought the easy access example would provide enough for you 
> to tell my
> why there is a difference.  And you have (thanks again).
> 
> My concern was exporting the matrix to excel and the 
> resulting 1.96*e(V)
> was giving me the CI's equivalent to the -svy: proportion (which in my
> case was giving me negative CI's).  After reading both your 
> responses I
> will transform the data to the logit and keep everything 
> nicely position
> between 0 and 1.  Hopefully, in this manner the mat2txt command or
> parmest will work nicely for me - and save me a lot of manual entry.
> 

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