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Reliability & Validity

Reliability & Validity. Reliability & Validity. Reliability = Does it provide a consistent result (even if it is wrong) Validity = Does it measure what it says it measures. Reliability. Inter Observer Test Retest Parallel Forms Split Half. Internal Validity. History Maturation Testing

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Reliability & Validity

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  1. Reliability & Validity

  2. Reliability & Validity • Reliability = Does it provide a consistent result (even if it is wrong) • Validity = Does it measure what it says it measures

  3. Reliability • Inter Observer • Test Retest • Parallel Forms • Split Half

  4. Internal Validity • History • Maturation • Testing • Instrumentation • Mortality • Statistical Regression to the Mean • Social Interaction • Diffusion of Treatment & Compensatory Rivalry • Resentful Demoralization & Compensatory Equalization

  5. External Validity- Generalizability • Lab vs Field Studies and other setting issues • Selection Bias • Pretest • Multiple Treatment • Reproduction Issues

  6. Construct Validity • Inadequate Preoperational Explication • Mono-Operation Bias • Mono-Method Bias • Interaction of Different TXs • Interaction of testing and Tx • Restricted Generalizability across Constructs • Confounding/Levels • Hypothesis Guessing • Evaluation Apprehension • Experimenter’s Expectations and Demand Characteristics

  7. Measurement Validity • Face Validity • Content • Criterion • Predictive • Concurrent • Construct • Discriminant

  8. Statistical Conclusion Validity • Statistical Significance • Remember Type I and Type II Errors?

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