def conditional_expected_average_profit(self, frequency=None, monetary_value=None):
        """
        Conditional expectation of the average profit.

        This method computes the conditional expectation of the average profit
        per transaction for a group of one or more customers.

        Parameters
        ----------
        frequency: array_like, optional
            a vector containing the customers' frequencies.
            Defaults to the whole set of frequencies used for fitting the model.
        monetary_value: array_like, optional
            a vector containing the customers' monetary values.
            Defaults to the whole set of monetary values used for
            fitting the model.

        Returns
        -------
        array_like:
            The conditional expectation of the average profit per transaction

        """
        if monetary_value is None:
            monetary_value = self.data["monetary_value"]
        if frequency is None:
            frequency = self.data["frequency"]
        p, q, v = self._unload_params("p", "q", "v")

        # The expected average profit is a weighted average of individual
        # monetary value and the population mean.
        individual_weight = p * frequency / (p * frequency + q - 1)
        population_mean = v * p / (q - 1)
        return (1 - individual_weight) * population_mean + individual_weight * monetary_value
Conditional expectation of the average profit.

        This method computes the conditional expectation of the average profit
        per transaction for a group of one or more customers.

        Parameters
        ----------
        frequency: array_like, optional
            a vector containing the customers' frequencies.
            Defaults to the whole set of frequencies used for fitting the model.
        monetary_value: array_like, optional
            a vector containing the customers' monetary values.
            Defaults to the whole set of monetary values used for
            fitting the model.

        Returns
        -------
        array_like:
            The conditional expectation of the average profit per transaction