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Slide Presentation of the 2007 Annual Meeting of AHRQ

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Weak Designs: No Causal Inference What Threats to Validity?

Text Description is below the image.

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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