hydroeval - Hydrological Evaluation Metrics and Goodness-of-Fit Summaries
Computes scalar performance metrics and goodness-of-fit
summaries for comparing simulated and observed hydrological or
regression values. Provides error metrics, percentage bias,
Nash-Sutcliffe efficiency, Kling-Gupta efficiency variants,
correlation measures, agreement indices, and comparison tables
via gof() and gof_compare(). Metric definitions are
registry-governed with shared validation, provenance-aware
wrappers, and explicit handling of undefined or degenerate
cases. Methods include Nash and Sutcliffe (1970)
<doi:10.1016/0022-1694(70)90255-6>, Gupta et al. (2009)
<doi:10.1016/j.jhydrol.2009.08.003>, Kling et al. (2012)
<doi:10.1016/j.jhydrol.2012.01.011>, and Willmott et al. (2012)
<doi:10.1002/joc.2419>.
