Handbook of Disease Burdens and Quality of Life Measures pp 4347-4347 | Cite as
The extent to which a scale measures what it purports to measure. Methodologies employed to test scale Validity mentioned in this chapter are:
Construct Validity. Tests whether particular scale measures the unobservable construct it claims to measure (e.g., adolescent QOL).
Convergent Validity. A variant of construct validity that shows a selected measure or scale is related to what it should theoretically be related to (e.g., increased QOL related to decreased depression). High correlations between these measures would be evidence of convergent validity.
Discriminant Validity. Opposite of convergent validity and another variant of construct validity, this procedure shows that a selected measure or scale is not related (diverges) from what is should theoretically not be related (e.g., increased QOL and increased social isolation).
Criterion-Related Validity. Criterion-Related Validity is used to determine the precision of a measure by comparing it with another, established...