A function 
of one or more parameters containing a noise term 
 |
where the noise is (without loss of generality) assumed to be additive.
Stochastic Function
See also
Noise, Stochastic OptimizationExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Stochastic Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/StochasticFunction.html