PSYC 330 Lecture Notes - Likert Scale, Observational Error, Content Validity

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Self- esteem likert scale random error. Mood, self- promotion, filler questions, reverse score, modesty, narcissism) Reliability- freedom from random error, whatever it is you are measuring is consistent. Consistency across time: test- retest (usually equivalent forms- same topic diff questions) Taking gre twice should get similar score- limits to how much improve. Can"t measure mood b/c is a state and changes over time: use correlation to determine reliability. Consistency across judges (inter- rater reliability: more than one judge evaluating something. Use good items: a priori (pretesting, post hoc (item deletion) Construct validity- is the test measuring what i think it"s supposed to measure. Subjective methods: face validity- what appears relevant or right, content validity- Objective methods- correlations between similar type measures: converging operations- different measures of same conceptual variables should be correlated, want as close to 1. Autobiographies variables: discriminating operations- want low correlation close to 0 between conceptual.

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