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Randomization in single-case design experiments: Addressing threats to internal validity.

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Summary
This summary is machine-generated.

Randomization enhances single-case experimental designs (SCEDs) by controlling validity threats often unaddressed by replication alone. This improves research credibility and statistical analysis for SCED intervention studies.

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Area of Science:

  • Psychology
  • Research Methodology
  • Behavioral Science

Background:

  • Single-case experimental designs (SCEDs) are crucial for evaluating interventions.
  • Traditional SCEDs rely heavily on replication to ensure internal validity.
  • Threats to internal validity can persist even with replication in SCEDs.

Purpose of the Study:

  • To review and detail various randomization strategies applicable to SCED methodology.
  • To explicate how specific randomization techniques control threats to internal validity.
  • To demonstrate the utility of randomization in both conventional and nonconventional SCEDs.

Main Methods:

  • Review of existing literature on randomization in experimental designs.
  • Categorization of randomization strategies: phase-order, between-intervention, within-intervention, and start-point randomization.
  • Application of these strategies to various SCED variations (e.g., ABAB, alternating treatment, multiple baseline) and non-replication designs.

Main Results:

  • Randomization offers explicit control over internal validity threats not fully addressed by replication.
  • Specific randomization methods are detailed for diverse SCED structures.
  • Randomization enhances scientific credibility, statistical conclusion validity, and likelihood of inclusion in literature syntheses.

Conclusions:

  • Randomization is a vital tool for strengthening the internal validity of SCEDs.
  • Implementing randomization increases the rigor and statistical power of SCED research.
  • Recommendations are made for establishing randomization standards in SCED methodology.