CEEP 476 Lecture 4: Measurement and Data Analysis

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Variables: factors interested in measuring constructs of interested. Ordinal scales: number used to indicate rank order (cid:894)how its used: rank order: (cid:1005)st, (cid:1006)nd, (cid:1007)rd, (cid:895) Interval scales: scores indicate quantities, equal intervals between scores, score of zero > just a point on the continuum. Score of zero does not indicate an absence of something (how its used: calculate score from participants responses on a test) Ex: temperature, iq scores, scores from personality tests. Ratio scales: scores indicate quantities, equal intervals between scores. Validity: evidence reflects how well the instrument measures for what it is designed for. Content related evidence: relationship between contents of an instrument and the construct. Criterion-related evidence/concurrent, predictive: evidence based on the relationship between test scores and external variables, existing criterion or predictive criterion.

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