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Re: st: Is there a better way of allocating individuals into different categories based on the probability of an event?


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Is there a better way of allocating individuals into different categories based on the probability of an event?
Date   Mon, 25 Mar 2013 09:40:19 +0100

On Sat, Mar 23, 2013 at 4:16 AM, Gwinyai Masukume wrote:
> Is there a better way of executing the code below which assigns
> individuals into the Non-smoker and Smoker categories based on the
> probability of smoking in pregnancy? <snip>  Assuming 84% of
> women do not smoke during pregnancy

I would rewrite the lines

> gen smoker1=int(1+(50000-1)*runiform())
> gen smoker=0 if smoker1 < 42000
> replace smoker=1 if smoker1 >= 42000

like this:

gen byte smoker = runiform() < .16

For more see:
M.L. Buis (2007), "Stata tip 48: Discrete uses for uniform()", The
Stata Journal, 7(3), pp. 434-435.
<http://www.stata-journal.com/article.html?article=pr0032>

-- Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
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