The different measurement scales are
distinguished on the basis of three important criteria-
·
Magnitude
When a scale has magnitude, one
instance of the attribute can be judged greater than, less than, or equal to
another instance of the attribute.
·
Equal intervals
Equal intervals denotes that the
magnitude of the concepts represented by unit of measurement on the scale is
equal regardless of where on the scale the unit falls.
·
Absolute Zero
An absolute zero point is a value that
indicates that nothing at all of the attribute being measured exists.
|
Level
|
Allows for
categorizing
|
Allows for
Ranking
|
Uses Equal
intervals
|
Possesses
real Zero point
|
|
Nominal
|
ok
|
|
|
|
|
Ordinal
|
ok
|
ok
|
|
|
|
Interval
|
ok
|
ok
|
ok
|
|
|
Ratio
|
ok
|
ok
|
ok
|
ok
|
Figure: Essential characteristics of
four levels of measurement
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