def METHOD_NAME(self):
    """
    PCE estimates of generalized total order Sobol indices, which characterize
    the sensitivity of a vector-valued quantity of interest on the random
    inputs.
    :return: Generalized total order Sobol indices.
    """
    inputs_number = self.pce_object.inputs_number
    if inputs_number == 1:
        raise ValueError('Not applicable for scalar model outputs.')
    variance = self.pce_object.get_moments()[1]
    total_order_indices = self.calculate_total_order_indices()
    variance_contributions = total_order_indices * variance
    total_variance = np.sum(variance)
    total_variance_contribution_per_input = np.sum(variance_contributions, axis=1)
    generalized_total_order_indices = total_variance_contribution_per_input / total_variance
    self.generalized_total_order_indices = generalized_total_order_indices
    return generalized_total_order_indices