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st: RE: drawing two stage random samples


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: drawing two stage random samples
Date   Tue, 29 May 2012 13:00:35 +0100

The only apparent non-standard detail here is sampling physicians first, 
i.e. selecting clusters first, then individuals. 

On that there is an existing FAQ which -search sample, faq- points to. 
Some other references are added here. 

FAQ     . . . . . . . . . . . . . . How can I draw a random sample of my data?
        . . . . . . . . . . . . . . . . . .  UCLA Academic Technology Services
        7/08    http://www.ats.ucla.edu/stat/stata/faq/sample.htm

FAQ     . . . . . . . . . . . . . . . . . Random samples from existing dataset
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        7/09    How can I take random samples from an existing dataset?
                http://www.stata.com/support/faqs/stat/sampling.html

FAQ     . . . . . . . . . . . . . . . . . . Sampling clusters, not individuals
        . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox and S. Merryman
        7/11    How can I sample clusters, not individuals?
                http://www.stata.com/support/faqs/data/sampleby.html

Example . . . . . . . . . . . Textbook examples: Sampling: Design and Analysis
        . . . . . . . . . . . . . . . . . .  UCLA Academic Technology Services
        4/05    examples from the book Sampling: Design and
                Analysis by Sharon L. Lohr
                http://www.ats.ucla.edu/stat/stata/examples/lohr/

The FAQ does recommend using -search- before you mail the list.

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

Shehzad Ali

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.


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