Fit OLS model with HAC/ARIMAX errors.
Note: This method expects X to already contain the transformed treatment
variables. Transform parameter estimation is handled by the experiment class.
- Parameters:
X (ndarray) – Full design matrix (n_obs, n_features) including baseline AND
transformed treatment variables.
y (ndarray) – Outcome variable (n_obs,).
- Returns:
self – Fitted model.
- Return type:
TransferFunctionOLS