def calculate_non_radial_reduction(target, radial_reduction, original):
    """ Calculates non-radial reduction value.

        Args:
            target (double): DMU target value.
            radial_reduction (double): radial reduction value.
            original (double): coefficient corresponding to DMU and category
                of interest.

        Returns:
            double: non-radial reduction value.
    """
    return target - original - radial_reduction
