@abc.abstractmethod<EOL><INDENT>def order_by_statistic(self, meter_id, style):<DEDENT>
pass<EOL>
Orders by a statistic for a given ``Meter``.

        :param meter_id: a meter ``Id``
        :type meter_id: ``osid.id.Id``
        :param style: search order style
        :type style: ``osid.SearchOrderStyle``
        :raise: ``NullArgument`` -- ``meter_id`` or ``style`` is ``null``

        *compliance: mandatory -- This method must be implemented.*