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Re: st: Sampling for proportion: characteristic of interest


From   Stas Kolenikov <skolenik@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Sampling for proportion: characteristic of interest
Date   Fri, 24 Aug 2012 13:57:36 -0500

What exactly is your question here? You have not really stated what do
you want to determine. You don't seem to have much of a design/sample
size issue here, if you are set on sampling a known number of cases.

When I write study precision and power sections, I usually specify
several levels of incidence -- e.g., 10%, 20% and 50%. The 50% would
be relevant for the Yes/No answers on your instrument; the 10%-20%
would be relevant for your Likert/multinomial scales.

-- 
-- Stas Kolenikov  ::  http://stas.kolenikov.name
-- Senior Survey Statistician, Abt SRBI  ::  work email kolenikovs at
srbi dot com
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer


On Fri, Aug 24, 2012 at 11:35 AM, Ilian, Henry (ACS)
<Henry.Ilian@dfa.state.ny.us> wrote:
> I need to take a quality-control sample for a case-reading study. A random sample of about 600 cases will be drawn and read, and I need a sample of those to be read by a second reader. The case-reading instrument has approximately 100 questions--the final number hasn't been determined yet. The response choices mostly form ordinal scales, although a few will be nominal, hence I'll be sampling for proportion.
>
> Everything I can find on sampling for proportion only considers the proportions for a single characteristic of interest. I have 100+ characteristics with different expected proportions. How do I approach this problem?
>
> Many thanks,
>
> Henry Ilian
>
>
>
>
>
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