Extrapolation, Interpolation, and Smoothing of Stationary Time Series
Extrapolation, Interpolation, and Smoothing of Stationary Time Series
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Simulation by modeling may be classified into three related methods. 1. We may use analog models which obey the same laws as the phenomena we wish to study. Instruments such as network analyzers, slide rules, and electrolytic tanks are examples of devices that are used to make analog models. 2. We may use mathematical models to describe phenomena we wish to study. Quite often we resort to high-speed computing machines or differential analyzers to solve specific problems from the equations derived in our mathematical models. 3. We may subject scaled models of equipment to actual or simulated environments. Wind-tunnel testing of airfoils is a notable example. Actual equipment may also be subjected to simulated expected or known environments, for example, experimentation with personnel and equipment in high-altitude chambers.