CRJ 302 Lecture Notes - Lecture 6: Content Validity, Operational Definition

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Assumes there is a reality; that theoretical concepts actually exist. Assumes that these concepts can be observed. Assumed that observed concepts can be measured. Assumes that our knowledge of concepts improves as our ability to measure improves. Measurement is a reification of concepts they become objectified. Nominal definitions: a working definition of the concept. Operational definition: the concept is defined precisely in terms of how it will be measured, the operations used to measure it. Need to reduce the likelihood of measurement failure or weak and biased measurements. To describe, and explain, to test, we need valid and reliable measurements. Faulty can be in the operational definition itself. Faulty can also be in the degree to which the operational definition provides us with valid and reliable measurement. Measurement validity: extent to which variation in scores reflects true differences between the persons or entities being measured.

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