See editing example Example of discriminant validity Note that it is important to assess convergent validity first, prior to discriminant validity. Both must be assessed in order to demonstrate construct validity. Researchers evaluate discriminant and convergent validity together. Not correlate with a test that is measuring a different construct.Correlate with a test that is measuring the same or a related construct.In order to show evidence of construct validity, a test should: In other words, discriminant validity focuses on differences, while convergent validity focuses on similarities. Convergent validity shows you that two tests that are supposed to be related to each other are, in fact, related.Discriminant validity shows you that two tests that are not supposed to be related are, in fact, unrelated.However, it’s important to keep in mind that they are not the same thing. convergent validityĭiscriminant and convergent validity help you establish construct validity. This depends on the accuracy of your operationalization-i.e., your ability to turn abstract concepts into measurable variables or observations. If that proves true, these two tests would have high discriminant validity.ĭiscriminant validity is important because it shows you whether your test accurately targets the construct of interest or if it assesses separate, unintentionally related, constructs.
In other words, individuals scoring high in security are not expected to score high in loneliness. In other words, it shows you how well a test measures the concept it was designed to measure.ĭiscriminant validity specifically measures whether constructs that theoretically should not be related to each other are, in fact, unrelated.įor example, the scores of two tests measuring security and loneliness theoretically should not be correlated. Frequently asked questions about discriminant validityĭiscriminant validity is a subtype of construct validity.This is an indication of poor discriminant validity. If there is a correlation, then you may be measuring the same construct in both tests. Since the two constructs are unrelated, there should be no significant relationship between the scores of the two tests. You have developed a questionnaire to measure extroversion, but you also ask your respondents to fill in a second questionnaire measuring intelligence in order to test the discriminant validity of your questionnaire. To establish discriminant validity, you must also measure an unrelated construct, such as intelligence. Example: Discriminant validity (divergent validity)You are researching extroversion as a personality trait among marketing students. In some fields, discriminant validity is also known as divergent validity. Thus, discriminant validity is an indication of the extent of the difference between constructs.ĭiscriminant validity is assessed in combination with convergent validity. If they are, then you cannot say with certainty that they are not measuring the same construct.
The expectation is that two tests that reflect different constructs should not be highly related to each other. Here, a construct is a behavior, attitude, or concept, particularly one that is not directly observable.
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Try for free What Is Discriminant Validity? | Definition & Exampleĭiscriminant validity refers to the extent to which a test is not related to other tests that measure different constructs. non-probability samplingĮliminate grammar errors and improve your writing with our free AI-powered grammar checker.
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