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Re: st: drawing two stage random samples


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: drawing two stage random samples
Date   Tue, 29 May 2012 10:59:09 -0400



Without knowing details about your population and study goals, it's difficult to give advice. I can say right now that, under the best of circumstances, the design you propose studies too many patients. 

Steve
sjsamuels@gmail.com


On May 29, 2012, at 7:34 AM, Shehzad Ali wrote:

Hi listers,

I am looking to draw a random sample from my dataset that has nested levels, i.e. patients (pt_id) nested within physicians (doc-id). I would like to randomly sample physicians (say 20%) and then randomly sample patients (say 20%) from the randomly selected physicians. The data is in long form with unique pt_id that are nested within doc_id.

Any advice would be appreciated.

Many thanks
Shehzad

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