Preparation for Child Psych PRITE and Boards
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To be valid, the result of a test has to accurately (i.e. reliably) answer the question that the test is intended to answer. | To be valid, the result of a test has to accurately (i.e. reliably) answer the question that the test is intended to answer. | ||
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Measures of reliability include inter-rater reliability, test-retest reliability, and internal consistency reliability. | Measures of reliability include inter-rater reliability, test-retest reliability, and internal consistency reliability. | ||
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| + | In psychiatry there is a particular issue with assessing the validity of the diagnostic categories themselves. | ||
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| + | In this context: | ||
| + | * '''Construct validity''' includes (at least) content, discriminant, and convergent validity. It answers the question: Are we measuring what we want to measure? | ||
| + | ** content validity refers to symptoms and diagnostic criteria, i.e. how well the test measures '''all''' aspects of a phenomenon; | ||
| + | ** discriminant/convergent validity assess if symptoms or properties that are suppose to be different/same are found to be different/same with a particular test. | ||
| + | * concurrent validity refers to weather a test correlates well with a measures that had previously been validated. | ||
| + | * predictive validity refers mainly to diagnostic stability over time; | ||
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==Further Reading== | ==Further Reading== | ||
Revision as of 21:35, 9 September 2012
To be valid, the result of a test has to accurately (i.e. reliably) answer the question that the test is intended to answer.
Reliability refers to consistency of a measuring instrument. Thus, reliability is necessary but not sufficient for validity. Inverse of reliability is "random error."
Measures of reliability include inter-rater reliability, test-retest reliability, and internal consistency reliability.
In psychiatry there is a particular issue with assessing the validity of the diagnostic categories themselves.
In this context:
- Construct validity includes (at least) content, discriminant, and convergent validity. It answers the question: Are we measuring what we want to measure?
- content validity refers to symptoms and diagnostic criteria, i.e. how well the test measures all aspects of a phenomenon;
- discriminant/convergent validity assess if symptoms or properties that are suppose to be different/same are found to be different/same with a particular test.
- concurrent validity refers to weather a test correlates well with a measures that had previously been validated.
- predictive validity refers mainly to diagnostic stability over time;
Further Reading
Kendell R. & Jablensky A. (2003) Distinguishing Between the Validity and Utility of Psychiatric Diagnoses Am J Psychiatry. January;160(1):4-12