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st: sample selection (-sample) in stata


From   Shikha Sinha <shikha.sinha414@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: sample selection (-sample) in stata
Date   Tue, 28 Jun 2011 12:43:12 -0700

Dear all,

My question is about sample selection in stata. I want to select 100
companies loated in 10 cities from an universe of 800 comapnies. My
data structure is as below:

City                  company id           Type (manufacturing)
1                             1                                 1
1                             2                                 0
1                             3                                  1
2                             4                                  0
2                             5                                  1
2                             6                                   0
..
.
.
.

.
.
so on.

I want to select a sample of 25 companies from these 100, using
probablity weights of slection i.e. Probability proportional to size.
Is there any comand in stata.
I have tried -sample but of no avail.

Please advise.
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