John Weirstrass Muteba Mwamba
Department of Economics and Econometrics
University of Johannesburg
Tel: +27-11-559-4371
Fax: +27-11-559-3039
D-Ring 218
Does WinBUGS use its own random number generator, or does it use one that is part of the computer's operating system?
Cory
----- Original Message -----
Sent: Saturday, February 06, 2010 4:07 PM
Subject: [BUGS] inconsistent chains across computers (windows Vista)
Dear List,
I have tried running identical code (same model, data, and initial values, with the same random seed set after the model is checked) on 4 different computers, using the same version of WinBUGS (1.4.3):
1. Windows Vista, 64 bit
2. Windows Server: Server 2003, 64 bit
3. Windows XP, 32 bit
4. Windows 7, 64 bit
The results are similar (but not identical) for computers 2-4, but computer 1 (Vista) produces quite different MCMC chains. When I run the same code multiple times on the same computer, the chains look the same. Has anyone ever encountered a similar problem?
I haven't been able to find a solution in the email archives. I've tried running WinBUGS in XP compatibility mode on the Vista computer, but it made no difference.
Thank you, in advance, for any insights you might have.
Best wishes,
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------------------------------------------------------------------- This list is for discussion of modelling issues and the BUGS software. For help with crashes and error messages, first mail
[log in to unmask] To mail the BUGS list, mail to
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Before mailing, please check the archive at www.jiscmail.ac.uk/lists/bugs.html Please do not mail attachments to the list. To leave the BUGS list, send LEAVE BUGS to
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