arnold on Sep 16, 2008
The development of systematic rules and meaningful units of measurement for quantifying empirical observations.
Thus, a measurement scale is established when we define the set of possible values that can be assigned during the measurement process and state an explicit assignment rule.
A scaling rule establishes a link or rule of correspondence between the elements in a data system and the elements in the real-number system. Once a scaling rule is specified and a number has been assigned to each element of the data system, these numbers are called scale values.