pastas.stats.signatures.colwell_constancy

colwell_constancy(series, bins=11, freq='W', method='mean', normalize=True)

Colwells constancy index after Colwell [1974].

Parameters

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

• bins (int) – number of bins to determine the states of the groundwater.

• freq (str, optional) – frequency to resample the series to.

• method (str, optional) – Method to use for resampling. Only “mean” is allowed now.

• normalize (bool, optional) – normalize the time series to values between zero and one.

Returns

c – Colwell’s constancy.

Return type

float

Notes

One minus the sum of entropy with respect to state, divided by the logarithm of the absolute number of possible states.