Fourier Amplitude Sensitivity Testing (FAST) is a global sensitivity analysis method used to assess how variations in model input parameters affect the output of a mathematical model. This approach is particularly useful in complex models with many inputs, as it allows researchers to identify which parameters have the most significant impact on the output. ### Key Concepts: 1. **Fourier Series**: FAST employs Fourier series to represent the behavior of the model output as a function of the input parameters.
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