Lecture 9 - Reliability & Validity 1 Reliability Most...

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1 Reliability & Validity
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2 Reliability • Most common definition – A reliable measure is one produces similar results when used on different occasions • If a measure does not produce reliable (consistent) results then we have to question its usefulness • Are the following measures reliable? – Height – IQ – Mood
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3 Reliability • Test-retest reliability easy to measure – Correlation – Percentage correspondence • Reliability in itself does not ensure good psychometric health – Suppose someone claimed that reaction time was a good measure of IQ • Reliability could be demonstrated but we would have to question the validity of this test
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4 Validity – different definitions • Correctness or truth of an inference • Validity with respect to IV – Are we truly manipulating that which we think we are – Does increasing the length of a digit span to be remembered actually engage IQ in a meaningful way?
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5 Validity – different definitions • Validity with respect to the DV
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Lecture 9 - Reliability & Validity 1 Reliability Most...

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