Definition of measurement;
According to Campbell 1940, measurement is the assignment of numbers to objects or event according to rules.
According to Nunnally 1970, Measurement consists of rules for assigning number to objects in such a way as to represent quantities of attributes.
Rules-indicate that the procedures for assigning numbers must be explicitly formulated.
Objects-in psychology are usually people or lower animals or material objects (some instances).
Quantification- concerns how much of an attribute is present in an objec numbers are used to communicate the amount.
Attribute- indicates that measurement always concerns some particular feature of objects.
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