solarforecastarbiter.metrics.event.critical_success_index

solarforecastarbiter.metrics.event.critical_success_index(obs, fx)

Critical Success Index (CSI).

\[\text{CSI} = \text{TP} / (\text{TP} + \text{FP} + \text{FN})\]

Parameters:

• obs ((n,) array-like) – Observed event values (True=event, False=no event).
• fx ((n,) array-like) – Forecasted event values (True=event, False=no event).

Returns:

csi (float) – The CSI of the forecast.

Raises:

RuntimeError – If there is no forecast or observation timeseries data, or the forecast and observation timeseries data do not have the same length.