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Table 2

Mathematical formulations of the objective functions and evaluation index

Objective functionMathematical formulationRange of valuesReference
NSE   Nash & Sutcliffe (1970)  
lnNSE   Kim & Lee (2014)  
Objective functionMathematical formulationRange of valuesReference
NSE   Nash & Sutcliffe (1970)  
lnNSE   Kim & Lee (2014)  

Note: Oi is the observed discharge at time step i; Si is the simulated discharge; Ō is the mean observed discharge over the entire simulation period of length N; is the mean simulated discharge over the entire simulation period of length N.

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