[R] Why R simulation gives same random results?

Nordlund, Dan (DSHS/RDA) NordlDJ at dshs.wa.gov
Wed Feb 20 23:34:22 CET 2013

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of C W
> Sent: Tuesday, February 19, 2013 5:32 PM
> To: r-help
> Subject: [R] Why R simulation gives same random results?
> Hi, list
> I am doing 100,000 iterations of Bayesian simulations.
> What I did is I split it into 4 different R sessions, each one runs
> 25,000
> iteration.  But two of the sessions gave the simulation result.
> I did not use any set.seed().  What is going on here?
> Thanks,
> Mike

I may have missed it, but I haven't seen a response to this question yet.  If no one has responded, it is probably because you haven't provided the code you used to run the simulation, or a reproducible example which demonstrates the problem.  You say you didn't use set.seed(), but you didn't show what you did do, so there is insufficient information for anyone to be able to comment what went wrong.


Daniel J. Nordlund
Washington State Department of Social and Health Services
Planning, Performance, and Accountability
Research and Data Analysis Division
Olympia, WA 98504-5204

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