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Title:

Threats to Conclusion Validity

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Threats to Conclusion Validity Low statistical power Violated assumptions of statistical tests Fishing and the Error Rate problem Low reliability of measures Poor ... – PowerPoint PPT presentation

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Title: Threats to Conclusion Validity


1
Threats to Conclusion Validity
2
Threats to Conclusion Validity
  • Low statistical power
  • Violated assumptions of statistical tests
  • Fishing and the Error Rate problem
  • Low reliability of measures
  • Poor reliability of treatment implementation

3
Threats to Conclusion Validity
  • Random irrelevancies in the setting
  • Random heterogeneity of respondents

4
Improving Conclusion Validity General Guidelines
  • Want good statistical power (gt .8)
  • Want good reliability
  • Want good implementation

5
Improving Conclusion Validity Specific
Suggestions
  • Pretest and posttest on same scales
  • Match before or after random assignment (but not
    in place of random assignment)
  • Use covariates
  • Increase reliability, especially of dependent
    measures
  • Adjust raw scores for unreliability
  • Estimate desired effect magnitude in advance
  • Each person as own control
  • Present effect and standard error
  • Select homogeneous samples
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