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Re: st: Sample question -- can't replicate my results from my laptop to desktop eventhough I set seed


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Sample question -- can't replicate my results from my laptop to desktop eventhough I set seed
Date   Thu, 22 Mar 2007 09:45:52 +0100

Anna wrote:

I drew a sample on my laptop using the following commands:

set seed  123456789
preserve
keep if iconst==1  /*sampling only construction sites*/
sample 30, count

I run my code on my desktop and I am getting different sites selected.

Any advice how to replicate it?

---------------------------------------------------------

If the datasets on your two computers are sorted differently, different
observations may be sampled. Look at these results:

sysuse auto.dta, clear
set seed 12345
sort weight
sample 10, count
summarize price

sysuse auto.dta, clear
set seed 12345
sort displacement
sample 10, count
summarize price

Hope this helps

Svend
__________________________________________

Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000  Aarhus C, Denmark
Phone: +45 8942 6090
Home:  +45 8693 7796
Email: sj@soci.au.dk
__________________________________________ 

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