chap05 - MeasurementConcepts MeasureaVariable Examples

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    Measurement Concepts  
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    Measure a Variable Examples Reaction time Rate your happiness Take an extraversion personality measure Obtain a score on the variable So your reaction time is .04 second (4/100  of a second)
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    Is the measure reliable? True score theory Obtained score reflects: True score Measurement error So, .04 second is your true score and  any measurement error Reliable measures have little  measurement error
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    Measurement Error A single score reflects your true score But: A bit faster today after a good night’s sleep A bit slower today because you missed  lunch
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    The best measure Multiple measures to average the  measurement error Not possible for most research So… Use measures that have little  measurement error – these are reliable  measures
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    How to determine reliability? Make sure that multiple measures are  consistent Consistency indicated high reliability
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    Test – retest reliability
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chap05 - MeasurementConcepts MeasureaVariable Examples

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