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Slide Presentation of the 2007 Annual Meeting of AHRQ

Weak Designs: No Causal Inference What Threats to Validity?

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Charts of the following designs:

Posttest-Only Design
- Treatment Group - Time = X O₁
Posttest-only Design with Nonequivalent Groups (cross sectional)
- Treatment Group - Time = X O₁
- Comparison Group - Time = O₁
Pretest-Posttest Design
- Treatment Group - Time = O₁ X O₂

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