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st: How do I demonstrate that a sample is randomly drawn from a population?


From   Yuval Arbel <yuval.arbel@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: How do I demonstrate that a sample is randomly drawn from a population?
Date   Sun, 14 Apr 2013 12:00:31 -0700

Dear statalisters,

I have two files:

1) The first file contains the grades of all population of Open
University students.

2) The second file contains the grades of Open University students,
who filled a questionnaire via the net.

I would like to show that the second file is a random sample drawn
from the first file.

The question is can I provide a statistical evidence that the sample
is indeed random? what are the appropriate commands in stata?

P.S. I thought to run the test of difference of means between two
populations. Having reconsidered, however, I'm not talking here about
two populations, but rather a sample,which is drawn from a given
population.

As always, your answers will be very much appreciated

--
Dr. Yuval Arbel
School of Business
Carmel Academic Center
4 Shaar Palmer Street,
Haifa 33031, Israel
e-mail1: yuval.arbel@carmel.ac.il
e-mail2: yuval.arbel@gmail.com
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