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Related Experiment Videos

How a regression artifact makes ICFs/MR look ineffective

F M Crinella1, R McCleary, J M Swanson

  • 1fmcrinel@uci.edu

Mental Retardation
|June 25, 1998
PubMed
Summary

A study re-analyzing Conroy's (1996) research found that negative quality-of-life impacts attributed to small Intermediate Care Facilities (ICFs) were likely a statistical artifact. This regression artifact resulted from flawed control group selection based on pretest matching.

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Area of Science:

  • Psychology
  • Sociology
  • Public Policy

Background:

  • Conroy's (1996) study suggested negative quality-of-life impacts for individuals with mental retardation in small Intermediate Care Facilities (ICFs).
  • The original study employed a matched-control group quasi-experimental design.

Discussion:

  • This analysis reveals Conroy's findings are likely a regression artifact due to selecting control groups based on pretest scores.
  • Matching on pretest scores, unlike static characteristics, invariably introduces large, spurious effects.
  • Historical literature dating back a century warns against this methodological flaw.

Key Insights:

  • The perceived negative quality-of-life impact was an artifact of the research design, not an effect of ICF placement.
  • Monte Carlo simulations confirm the magnitude of this artifact is substantial.

Related Experiment Videos

  • Methodological rigor in quasi-experimental designs, particularly regarding control group selection, is crucial for valid conclusions.

    • Outlook:

    • Re-evaluation of past research utilizing pretest matching is warranted.
    • This highlights the need for careful consideration of statistical artifacts in policy-related research.
    • Future studies should employ robust designs to avoid such biases and ensure accurate policy recommendations.