If I alter the original PEST dataset, do I need to re-calculate the Jacobian matrix before running SVDAPREP to set up SVD-assisted parameter estimation?
Not necessarily. If alterations to the original PEST dataset are restricted to the following, then you can create a new Jacobian matrix corresponding to the altered PEST dataset using the JCO2JCO utility. • Removal, tying or fixing of parameters; • Alterations to the transformation status of any parameters; • Removal of observations or alterations to their weights; • Additions or removal of prior information.
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