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What options are available to me if a model’s derivatives are so bad that PEST simply will not work?

April 26, 2017bad derivatives model Options pest

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What options are available to me if a model’s derivatives are so bad that PEST simply will not work?

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Use the SCEUA_P or CMAES_P global optimisers provided with PEST. They can be used interchangeably with PEST; hence no modification of a PEST input dataset is required prior to their use. They are also parallelisable.