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pastas.stats.signatures.cv_date_min#

cv_date_min(series)[source]#

Coefficient of variation of the date of annual minimum head.

Parameters

series (pandas.Series) – Pandas Series with DatetimeIndex and head values.

Returns

cv – Coefficient of variation of the date of annual minimum head.

Return type

float

Notes

Coefficient of variation of the date of annual minimum head computed using circular statistics as described in Fisher [1995] (page 32). If there are multiple dates with the same minimum head, the first date is chosen. The higher the coefficient of variation, the more variable the date of the annual minimum head is, and vice versa.