smooth.ADAM.phi_

property ADAM.phi_: float | None

$phi).

The damping parameter (phi) controls how quickly the trend dampens toward zero over the forecast horizon. A value of 1.0 means no damping (linear trend), while values less than 1.0 cause the trend to gradually flatten.

Returns:

Damping parameter value between 0 and 1, or None if the model does not include a damped trend component.

Return type:

Optional[float]

Raises:

ValueError – If the model has not been fitted yet.

Notes

Uses trailing underscore following scikit-learn convention for fitted parameters.

Examples

>>> model = ADAM(model="AAdN")  # Damped trend model
>>> model.fit(y)
>>> print(f"Damping: {model.phi_:.3f}")

Type:

Damping parameter for trend component (R