PSYC 226 Ch 3, 1.30.12

PSYC 226 Ch 3, 1.30.12 - Defining and Measuring Variables...

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Defining and Measuring Defining and Measuring Variables Variables Chapter 3 PSYC 226
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Face validity Face validity Looks at the “face value” of the measure Does the Beck Depression Inventory-II look like it measures depression? Changes in Sleep Appetite Enjoyment in activities Libido Mood Face validity can be tricky No way to quantify If the purpose of a measurement is too obvious, this can skew a participant’s responses Social desirability
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Concurrent validity Concurrent validity Does a new measure correlate with existing measures of the same construct? Compares a new measure with a well-established measure Example: IQ tests Wechsler Intelligence Scale for Children, 4 th ed. Stanford-Binet Intelligence Test, 5 th ed. Remember: concurrent validity does not mean that the 2 measures are identical However, this type of validity builds support for a new measure
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Predictive validity Predictive validity When the measure accurately predicts a behavior. Example: IQ tests predict school performance Positive relationship between IQ score and school performance
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Construct validity Construct validity The scores obtained from a measure behave in the same way as the variable does. Example: aggression increases as temperature increases More violence occurs in warmer times of year Measure of aggression should behave in the same way Never established absolutely New research comes out every day This is more of an ideal that we approach with each new research finding
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Convergent validity Convergent validity Two different measures developed to measure the same construct Compares 2 new measures of a construct Example: aggression in preschoolers Measured by Teacher report Playground observations
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Divergent validity Divergent validity Using 2 different measures to show we are measuring 2 different constructs There should be little to no relationship between scores on the 2 measures Example: aggression in preschoolers In our observations, are we measuring aggression or activity level?
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