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This allows customisation of optimisation weights among objective functions. default is even weight c(1, 1). It also allows 0 weight, equal to removing an objective function. check function needs to be amended, because the values needs to be >=0 and the same length as obj.fun count
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Defaulting stronger weight for DECOMP.RSSD while refreshing (1 for NRMSE, 10 for DECOMP.RSSD) to further curb refresh discrepancy & encourage better explainability. This can be override manually by setting objective_weights in robyn_refresh().
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An experimental feature: adding an argument objective_weights to allow manual customization of objective function weightage. For example, with NRMSE & RSSD have same weights of c(1,1) by default. Set to 0 is possible. WARNING: The weights cannot be optimised. Any customisation is arbitrary and has strong risk of bias.