How to compute the validity of a diagnostic psychometric test?
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i've trying to find out how to compute the validity of a diagnostic psychometric test. The test has correct or wrong answers and not using a scale so factor analysis is out of the question? im just correlating item answers with the test raw scores.
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Answer:
If you want to compute the validity of the test then you have to correlate test scores with some external construct that the test theoretically should be related to. So perhaps some other test that measures about the same concept would be helpful. Of course you have to administer your test along with the other test to a large group of people. Michael Host of The Psych Files podcast http://www.thepsychfiles.com
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