Re: st: Why do i get a failure all the time with this message?

[Roger Newson <roger.newson@kcl.ac.uk>]

At 18:16 27/08/2004, jon ebeling wrote:
> I"ve tried to send this to you several times. I get an error message
> every time I try, but here is what I wanted to send.
>
>
> I'm confused by something in svymean and repcat.
>
> Here is what I've done:
>
> I've created some repcat categories using a variable I've created from
> the joint cell frequencies on a crosstabulation I've been using, and I
> want to use the ci's for each of the joint frequencies. So I did the
> following:
.
.
.

> .
> Now shouldn't the samples be 47, 51, 49, and 61 for each of the
> confidence intervals I've created ci's for?

No, they shouldn't. The dummies you entered into -ci- (created by 
-tabulate-) are equal to one for observations with the appropriate value of 
-cells-, zero for observations with any other non-missing value of -cells-, 
and missing for observations with missing values of -cells-. The sample 
numbers are therefore all 208=47+51+49+61, The confidence intervals, 
however, are correct for estimating the proportions with each value of 
-cells-, assuming that the observations are independent.

I do not know how this connects with -svymean-. However, I hope this helps.

Roger




--
Roger Newson
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
5th Floor, Capital House
42 Weston Street
London SE1 3QD
United Kingdom

Tel: 020 7848 6648 International +44 20 7848 6648
Fax: 020 7848 6620 International +44 20 7848 6620
  or 020 7848 6605 International +44 20 7848 6605
Email: roger.newson@kcl.ac.uk
Website: http://www.kcl-phs.org.uk/rogernewson

Opinions expressed are those of the author, not the institution.

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/