13.3. Validity and other topics
A measure is said to be valid if it accurately reflects the concept it is intended to measure. Assessing the validity of a measure typically includesquantifying convergent validity, divergent validity, and discriminant validity. These three topics, which comprise the assessment of the construct validity of an instrument, can be addressed in a quantitative fashion and will be discussed below.
Content validity is another topic which is typically addressed in the development stage of a measurement tool. Content validity refers to the degree to which a measure covers the range of meanings that are part of the concept to be measured. The most common approaches to assessing content validity are expert reviews of the ...
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