# Random Number Generators

The Random Number Generators dialog box allows you to select the random number generator and set the starting sequence value so you can reproduce a sequence of random numbers.

**Active Generator.** Two different random number generators
are available:

- Version 12 Compatible. The random number generator used in version 12 and previous releases. If you need to reproduce randomized results generated in previous releases based on a specified seed value, use this random number generator.
- Mersenne Twister. A newer random number generator that is more reliable for simulation purposes. If reproducing randomized results from version 12 or earlier is not an issue, use this random number generator.

**Active Generator Initialization.** The random number seed
changes each time a random number is generated for use in transformations
(such as random distribution functions), random sampling, or case
weighting. To replicate a sequence of random numbers, set the initialization
starting point value prior to each analysis that uses the random numbers.
The value must be a positive integer.

Some procedures, such as Linear models, have internal random number generators.

To select the random number generator and/or set the initialization value:

- From the menus choose: