PSYC 2P25 Lecture Notes - Lecture 2: Trait Theory, Criterion Validity, Job Performance
4 Feb 2016
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When a characteristic is measured by obtaining ratings made by. Scores on the total (or average) rating should depend strongly on the raters" common judgment. Tells you the extent to which the scores represent the common element shared by raters. Interrater reliability indicates the extent to which overall scores represent the common element of scores given by the various raters. If variable is supposed to be a lasting characteristic (not a temporary state), then; Measurements taken on two occasions (e. g. a few weeks apart) should be highly correlated. Test-retest reliability is usually calculated simply as the correlation between scores on two occasions (occasions should not be years apart, because then a low correlation might be due to developmental changes, not poor reliability. ) Even if a measurement is reliable (i. e. it measures some characteristic accurately) it might not be the right characteristic. Validity means evidence that measurement assesses the.
