In a subjective view, if multiple objective functions are available for a model calibration procedure, SAR (or other SAR-related formulae) may still deserve a default choice because users who are not concerned about either high or low values, may not care about the objective function when they use a model APO866 procedure, especially considering that most users may not (or do not need to) scrutinize the details of a published procedure (e.g., FME and SWAT-CUP). Conversely, users who are inclined to emphasize extreme values (e.g., flood modeling) will usually intend to incorporate selection of an objective function, which can force them to investigate the procedure they are planning to use and modify protostomes as needed (Kang, 2011, Krause et al., 2005 and Legates and McCabe, 1999). Using the popular FME R package as an example, SSR is the only available objective function, and few users would consider modifying it by scrutinizing into the code. However, our case studies (using R-SWAT-FME and R-EDCM-FME) suggest that SAR may be a more appropriate choice than SSR (or at least a default one) for this package.
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