Sociology / Unit 2 Soc 0153 short lesson, about 20 seconds
Validity
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The idea
A measure is valid when it actually captures the concept it claims to capture, rather than something merely correlated with it.
In practice
Counting library visits measures library use; calling it a measure of intelligence is invalid.
Where people slip
Validity and reliability are separate tests, and a study needs both.
Your place on the trail
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