arch.univariate.FixedVariance.backcast_transform¶

FixedVariance.backcast_transform(backcast: float | ndarray[Any, dtype[float64]]) → float | ndarray[Any, dtype[float64]]¶

Transformation to apply to user-provided backcast values

Parameters:¶

backcast: float | ndarray[Any, dtype[float64]]¶

User-provided backcast that approximates sigma2[0].

Returns:¶

backcast – Backcast transformed to the model-appropriate scale

Return type:¶

{float, ndarray}