ch 4 - Chapter 4 Predictors Psychological Assessments Predictor any variable used to forecast a criterion Assessing the quality of predictors

ch 4 - Chapter 4 Predictors Psychological Assessments...

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Chapter 4: Predictors Psychological Assessments Predictor any variable used to forecast a criterion Assessing the quality of predictors Psychometric literally, the measurement (“metric”) of properties of the mind (“psychic”) – it is the standard used to measure the quality of psychological assessments If a predictor is not both reliable and valid, it is useless Reliability o Refers to consistency and stability o Reliability the consistency, stability, or equivalence of a measure o A measure should yie ld the same estimate on repeated use if the measured trait hasn’t been changed o Test-retest reliability Reveals the stability of test scores upon repeated applications of the test Simplest assessment of a measuring device’s reliability Measure something at 2 different times and compare scores Coefficient of stability: the higher, the more reliable the scores (~.70 = acceptable) The shorter the interval between two tests, the higher the test-retest reliability coefficient o Equivalent-form reliability Reveals the equivalence of test scores between two versions or forms of the test Two forms of a test which measure the same attribute given to an individual researcher correlates the two Correlation of equivalence Least popular it’s hard to make two different tests for the same thing o Internal-consistency reliability Reveals the homogeneity of the items comprising a test Split-half reliability test is given and then scored twice, once for the odd numbers and once for the even correlate the two The longer the test, the greater its reliability Cronbach’s alpha or Kuder -Richardson 20 (KR20) each test item is a minitest the response to each item is correlated with the response to every other item Homogeneous test = similar item content = high internal consistency reliability coefficient Used frequently o Inner-rater reliability Reveals the degree of agreement among the assessments of two or more raters Conspect reliability Used frequently Validity o Refers to accuracy o Reliability is inherent in a measuring device; validity depends on the use of a test o Validity a standard for evaluating tests that refers to the accuracy or appropriateness of drawing inferences from test scores o It’s not “valid/not valid” – it can range from “not valid” to “highly valid” o Construct validity Construct validity the degree to which a test is an accurate and faithful measure of the construct it purports to measure Convergent validity coefficients reflect the degree to which the scores from our new test of intelligence (for ex.) and the existing measures of intelligence converge in assessing intelligence Divergent validity coefficients reflect the degree to which scores from two tests that shouldn’t correlate diverge from each other in assessing unrelated concepts
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  • Fall '16
  • John Meyer
  • criterion-related validity, personnel selection

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