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+'''
+Created on Mar 22, 2012
+
+@author: steger, jozsef
+
+@summary: Class representation of the measurement levels (aka measurement scale) defined by Stanley Smith Stevens.
+Stevens proposed his theory in a 1946 Science article titled "On the theory of scales of measurement".
+@note: These classes are not meant to be instantiated ever.
+'''
+
+class MeasurementLevel:
+ '''
+ @summary: It serves as the common scheme for the measurement levels. Only its subclasses have a meaning.
+ '''
+ pass
+
+class Nominal(MeasurementLevel):
+ '''
+ @summary: Values of this kind of measurement are mere elements of a set.
+ '''
+ pass
+
+class Ordinal(Nominal):
+ '''
+ @summary: A ranking is defined between the values of this kind of measurement.
+ '''
+ pass
+
+class Interval(Ordinal):
+ '''
+ @summary: A difference is defined which can be evaluated for any two values of this kind of measurement.
+ '''
+ pass
+
+class Ratio(Interval):
+ '''
+ @summary: There is a reference value defined for this kind of measurement, that is "zero" has a meaning.
+ '''
+ pass
+
+lut_level = {
+ 'NominalLevel': Nominal,
+ 'OrdinalLevel': Ordinal,
+ 'IntervalLevel': Interval,
+ 'RatioLevel': Ratio,
+}