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Reliability

Reliability. Consistent Dependable Replicable Stable. Threats to reliability. Construction Administration (tester, testee, environment) Scoring Interpretation. Two Administrations. Test/retest same test - same group Parallel/Alternate forms different tests - same group.

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Reliability

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  1. Reliability • Consistent • Dependable • Replicable • Stable

  2. Threats to reliability • Construction • Administration (tester, testee, environment) • Scoring • Interpretation

  3. Two Administrations • Test/retest same test - same group • Parallel/Alternate forms different tests - same group

  4. One Administration Internal consistency One test - one group - one administration • Split Half first/second or odd/even halves???? Spearman-Brown formula • Statistical estimation Kuder-Richardson Formula 20 (KR20) Cronbach alpha (alpha coefficient) • (factor analysis)

  5. Reliability coefficient • 0.00 - 1.00 • higher is better • score is relative, not absolute

  6. Inter-rater reliability • Consensus • Percentage of agreement • Kappa statistic (2 or many raters)

  7. Project homework • Which approach (and why) would you use to determine the reliability of your measure?

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