Before revision:  To remedy this ,  more complex notions of value-sharing from economics and game-theory, such as the Shapley value need to be used to capture the effect of mixing datasets on the accuracy of forecasting algorithms driven by them .
After revision:  To remedy this , or the ``leave-one-out'' heuristic, are inaccurate. Instead, more complex notions of value-sharing from economics and game-theory, such as the Shapley value need to be used to capture the effect of mixing datasets on the accuracy of forecasting algorithms driven by them .