“…The most commonly used metamodels are input-output mappings that project the values of simulation inputs to the expected values of outputs. They include, e.g., regression models (Kleijnen 2008), spline models (Barton 1998), neural networks (Fonseca, Navaresse, and Moynihan 2003), Kriging models (Ankenman, Nelson, and Staum 2010), response surfaces (Kleijnen and Sargent 2000), and game theoretic models Virtanen 2010a, Pousi, Poropudas, andVirtanen 2010). There also exists other metamodeling approaches such as dynamic Bayesian networks describing the time evolution of DES models Virtanen 2007, Poropudas andVirtanen 2011) and influence diagrams used for studying the consequences of decision alternatives in simulation based decision making and optimization (Poropudas and Virtanen 2009).…”