def local_error(self, originalValue, calculatedValue):
        """Calculates the error between the two given values.

        :param list originalValue:    List containing the values of the original data.
        :param list calculatedValue:    List containing the values of the calculated TimeSeries that
            corresponds to originalValue.

        :return:    Returns the error measure of the two given values.
        :rtype:     numeric
        """
        originalValue = originalValue[0]
        calculatedValue = calculatedValue[0]

        if 0 == originalValue:
            return None

        return (math.fabs((calculatedValue - originalValue)/float(originalValue))) * 100.0