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Model evaluation or assessment is a process by which interested parties, who were not involved in a model's origins, development and implementation, can assess the model's results in terms of its structure and data inputs so as to determine, with some level of confidence, whether or not the results can be used in decision making (Gass, 1977). Model evaluation encompasses: (1) verification, validation, and quality control of the usability of the model and its readiness for use, and (2) investigations into the assumptions and limitations of the model, its appropriate uses, and why it produces the results it does (Greenberger and Richels, 1979).
There are three reasons for advocating evaluation of models: (1) for many models, the ultimate decision maker is far removed from the modeling process and a basis for accepting the model's results by such a decision maker needs to be established; (2) for complex models, it is difficult to assess and to comprehend fully the interactions and impact...
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