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PEST is a nonlinear parameter estimation package with a difference! The difference is that PEST can be used to estimate parameters for just about any existing model whether or not you have the model's source code.
PEST is able to "take control" of a model running it as many times as it needs while adjusting its parameters until the discrepancies between selected model outputs and a complementary set of field or laboratory
measurements is reduced to a minimum in the weighted least-squares sense.
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