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Relationships Among Pre-Post Designs

This text delves into the intricacies of pre-post study designs, including randomized experiments, nonequivalent group designs, and regression-discontinuity designs. The primary focus is on selection threats and the importance of group similarity prior to treatment. It discusses how assignment methods influence treatment probabilities based on pretests, emphasizing the significance of establishing pretest equivalence to ensure the reliability of outcomes. By examining various assignment strategies, this work aims to enhance understanding of experimental methodologies and their implications in research.

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Relationships Among Pre-Post Designs

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  1. Relationships Among Pre-Post Designs

  2. Pre-Post Designs O X O O O • Randomized experiment (R) • Nonequivalent group design (N) • Regression-Discontinuity design (C)

  3. The Main Issue • Selection threats • Are the groups similar before the treatment? • Related to assignment method in each design

  4. Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0 .5 0 Pretest

  5. Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0 RE .5 0 Pretest

  6. Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0 RE .5 RD 0 Pretest

  7. Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0 RE .5 NEGD RD 0 Pretest

  8. Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0 RE .5 NEGD RD 0 Pretest

  9. Pretest Equivalence Maximally nonequivalent Equivalent

  10. Pretest Equivalence RE Maximally nonequivalent Equivalent

  11. Pretest Equivalence RD RE Maximally nonequivalent Equivalent

  12. Pretest Equivalence RD NEGD RE Maximally nonequivalent Equivalent

  13. Assignment Rule Known Randomized Experiment Nonequivalent Group Design Regression-Discontinuity

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