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


From   Roger Newson <roger.newson@kcl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Why do i get a failure all the time with this message?
Date   Fri, 27 Aug 2004 19:04:03 +0100

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.

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