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Why are convergent and discriminant validity often evaluated together?

User Nhershy
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Since convergent validity is described as what a measure should correlate with, and discriminant validity is described as what a measure should not correlate with, it's easy to understand that they are evalued together, their results being complimentary one to another, knowing what a measure actually measures also let's you know what it does not measure.
User Gregnr
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