@staticmethod
def _classification_function_two(salary, commission, age, elevel, car,
    zipcode, hvalue, hyears, loan):
    """ classification_function_two

        Parameters
        ----------
        salary: float
            Numeric feature: Salary.

        commission: float
            Numeric feature: Commission.

        age: int
            Numeric feature: Age.

        elevel: int
            Categorical feature: Education level.

        car: int
            Categorical feature: Car maker.

        zipcode; int
            Categorical feature: Zipcode.

        hvalue: flaot
            Numeric feature: Value of the house.

        hyears: float
            Numeric feature: Years house owned.

        loan: float
            Numeric feature: Total amount of loan.

        Returns
        -------
        int
            Returns the sample class label, either 0 or 1.

        """
    if age < 40:
        return 0 if elevel == 0 or elevel == 1 else 1
    elif age < 60:
        return 0 if elevel == 1 or elevel == 2 or elevel == 3 else 1
    else:
        return 0 if (elevel == 2 or elevel == 3) or elevel == 4 else 1
