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Reliability and Validity

Scale Evaluation. Validity. Reliability. Content. Test-Retest. Internal Consistency. Criterion. Alternative Forms. Construct. Convergent Validity. Discriminant Validity. Nomological Validity. Reliability and Validity. Determination of Validity and Reliability.

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Reliability and Validity

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  1. Scale Evaluation Validity Reliability Content Test-Retest Internal Consistency Criterion Alternative Forms Construct Convergent Validity Discriminant Validity Nomological Validity Reliability and Validity

  2. Determination of Validity and Reliability

  3. Multitrait - Multimethod Matrix (Campbell & Fiske, 1959) { b1 = reliability for method 1 va = convergent validity for both methods wrt trait a m1 = discriminant validity for method 1 d = “nonsense”-correlation Correlationcoefficients • Requirements: • v > 0 and "high enough" • v > d • v > m • d low

  4. ExampleMosher Forced Choice Guilt Scale 3 traits • Guilt feelings about sex • Hostile guilt • Guilt concerning morality 3 methods • Incomplete sentences "When I dream about sex …" • Forced choice • " When I dream about sex …" • I don't remember a thing in the morning • I feel happy when I get up • True/False • "When I dream about sex I wake up feeling happy"

  5. MTMM matrix for the Mosher Forced Choice Guilt Scale Sexual Hostile Morality FC very reliable, TF too, IS not Good convergent validity Discriminant validity OK

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