hydroeval.nse

hydroeval.nse(simulations, evaluation)

Nash-Sutcliffe Efficiency (NSE) as per Nash and Sutcliffe, 1970.

Calculation Details

\[E_{\text{NSE}} = 1 - \frac{\sum_{i=1}^{N}[e_{i}-s_{i}]^2} {\sum_{i=1}^{N}[e_{i}-\mu(e)]^2}\]

where N is the length of the simulations and evaluation periods, e is the evaluation series, s is (one of) the simulations series, and μ is the arithmetic mean.