# Statistical Functions

The Vector Statistical Library (VSL) contains two sets of functions (see Statistical Functions):

- The first set includes a collection of pseudo- and quasi-random number generator subroutines implementing basic continuous and discrete distributions. To provide best performance, the VSL subroutines use calls to highly optimized Basic Random Number Generators (BRNGs) and a library of vector mathematical functions.
- The second set includes a collection of routines that implement a wide variety of convolution and correlation operations.

Parent topic: About This Software