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validity-the concptual definition
- the validity of a measurement is the correlation between this measurement and the true measurement of the construct.
- this is impossible because we can never have a "true" measurement of a abstact construct that is why we call it abstract
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construct validation
- since we cant have a direct measurement of an abstract construct, we take an indirect approach. we take an "end-run" around the problem by measuring a construct in multiple ways
- each measurement provides a different perspective on the construct
- correlate variable that we can measure
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content validity
looks at the applicability and breadth of the measurements of the construct
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criterion-related validity
- two types: concurrent criterion validity
- predictive criterion validity
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Concurrent criterion validity
the criterion is measured at the same time as the test
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Predictive criterion validity
- the criterion is measured later, after the test
- ex. pregnancy test, fighter jet pilot test, firefighter test
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convergent validity
- multiple tests of the same thing
- usually involves correlating a new test of a construct(ex. intelligence) with a well established test of the same construct
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discriminant validity
- measurements should not correlate with different and irrelevant constructs
- in other words, your measurement should discriminate between what you want to measure and things you dont want to measure
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experimental manipulation
- use our measurement as a dependent variable in an experiment
- create an independent variable that should have an effec on our measurement (DV)
- ex. we created a measurement for mood. we then manipulate mood in an obvious way and see whether it influences our measurement
- we do an experiment to test whether an independent variable that is known to have a effect on an dependent variable that we are not sure about
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formula to find correlation
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