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RE: st: Randomly change a date in Stata


From   Tim Evans <Tim.Evans@wmciu.nhs.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Randomly change a date in Stata
Date   Tue, 19 Jun 2012 13:41:00 +0100

Hi Maarten,

Thanks for your comment - an amateurish oversight of mine - I didn't realise that you had to set the seed for each command - I assumed it was for each session!

Best wishes

Tim


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis
Sent: 19 June 2012 12:55
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Randomly change a date in Stata

On Tue, Jun 19, 2012 at 1:37 PM, Tim Evans wrote:
> If I use the following, I don't actually manage to re-create the same date:
>
> set seed 339487731
> gen date7 = datediag + ceil(11 * runiform()) - 6
> gen date8 = datediag + ceil(11 * runiform()) - 6
>
> The dates are different - do you know why this may be?

You will get the same dates when you precede the command with the same seed:

set seed 339487731
gen date7 = datediag + ceil(11 * runiform()) - 6
set seed 339487731
gen date8 = datediag + ceil(11 * runiform()) - 6

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


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