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>.
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