Psychology 2840F/G Lecture Notes - Lecture 3: Content Validity, Face Validity, Concurrent Validity

• School: Western University
• Department: Psychology
• Course: Psychology 2840F/G
• Professor: gibson

Document Summary

Ways to measure variables: constructs and operationalizations. Construct/conceptual variable or de nition (e. g. well being) Operationalization (e. g. 5 item scale, # of smiles, brain scan: 3 types of operationalizations; (1) self report (2) observational (3) physiological: scales of measurement. Quantitative: ordinal (meaningful values but unequal intervals between units, interval (equal intervals between units but no meaningful zero, ratio (equal intervals and a meaningful zero) Reliability of measurement: reliability: do you get consistent scores every time, test retest reliability: people get consistent scores every time they take the test, internal reliability: people consistent scores on every item of a questionnaire. The extent to which multiple measures, or items, are all answered the same by the same set of people. Cronbach"s alpha: an average of all of the possible item total correlations: inter-rater reliability: two coders" ratings of a set of targets are consistent with each other.