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Relationships Among Pre-Post Designs. Pre-Post Designs l Randomized experiment (R) l Nonequivalent group design (N) l Regression-Discontinuity design.

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Presentation on theme: "Relationships Among Pre-Post Designs. Pre-Post Designs l Randomized experiment (R) l Nonequivalent group design (N) l Regression-Discontinuity design."— Presentation transcript:

1 Relationships Among Pre-Post Designs

2 Pre-Post Designs l Randomized experiment (R) l Nonequivalent group design (N) l Regression-Discontinuity design (C) OXOOOOXOOOO

3 The Main Issue l Selection threats l Are the groups similar before the treatment? l 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 1.0.5 0 RE Pretest

6 Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0.5 0 RE RD Pretest

7 Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0.5 0 RE RD NEGD Pretest

8 Assignment Method Probability of Assignment to Treatment Given the Pretest 1.0.5 0 RE RD NEGD Pretest

9 Pretest Equivalence Equivalent Maximally nonequivalent

10 Pretest Equivalence Equivalent Maximally nonequivalent RE

11 Pretest Equivalence Equivalent Maximally nonequivalent RDRE

12 Pretest Equivalence Equivalent Maximally nonequivalent RDNEGDRE

13 Assignment Rule Known 4 4 Regression-Discontinuity Randomized Experiment Nonequivalent Group Design

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