Which random number generator does @RISK use? Can I choose a generator?

By default, @RISK/RISKOptimizer uses the Mersenne Twister. 

You can select a random number generator on the Sampling tab of the Simulation Settings dialog.

Mersenne Twister is superior to RAN3I in that it has been more extensively studied and characterized.

• It has been proven that random numbers generated by the Mersenne Twister are equi-distributed up to 623 dimensions.
• Its period is 2^19937 - 1, which is more than 10^6000.

 

Variations between @RISK versions

From one version to the next, new features, and improvements in our code, may cause distributions to be evaluated in a different order. 

• You cannot count on reproducing @RISK results iteration from one version of @RISK to another.
•  The results will always match within normal statistical variability.

 

 

Related Articles:

What is Mersenne Twister (MT)?

Random Number Generation, Seed Values, and Reproducibility