hydromt.stats.skills.nashsutcliffe#

hydromt.stats.skills.nashsutcliffe(sim, obs, dim='time')[source]#

Return the Nash-Sutcliffe model efficiency.

Efficiency is based on a simulated and observed time series.

$$\begin{gathered} \begin{array}{r}NSE=1-\\ frac \\ su{m}_{i=1}^N(si{m}_i-ob{s}_i{)}^2 \\ su{m}_{i=1}^N(ob{s}_i- \\ barobs{)}^2\end{array} \end{gathered}$$

Parameters:

• sim (xarray DataArray) – simulations time series

• obs (xarray DataArray) – observations time series

• dim (str, optional) – name of time dimension in sim and obs (the default is ‘time’)

Returns:

the Nash-Sutcliffe model efficiency

Return type:

xarray DataArray