Replicability in Psychological Research

Replicability in Research

  • Measures are reliable/replicable if they yield similar results with a subject under the same conditions.
  • Replicability refers to reproducing results of an entire study under similar procedures.
  • Exact replications are uncommon; studies usually introduce new elements.
  • Critical for studies in scientific literature to demonstrate reliability.

Open Science Collaboration Study (2015)

  • Attempted to replicate 100 experiments from top psychology journals (published in 2008).
  • Only about 1/3 of replications yielded statistically similar results to original studies.
  • Combined results showed 68% of studies yielded significant findings.

Reasons for Non-Replicability

  1. Statistical Significance:
    • An effect is considered significant if it meets a specific probability level (95% in psychology).
    • Chance can explain some non-replications.
  2. Context Effects:
    • Variations in experiment conditions or subject populations can influence results.
    • Differences in subject backgrounds (e.g., country) may affect outcomes.
  3. Cautious Nature of Science:
    • Science typically avoids accepting new findings that deviate significantly from established knowledge.
    • Textbooks may exclude novel findings until broadly accepted in the field.

Implications for Psychological Science

  • Not all findings are absolutely replicable.
  • Sciences evolve with new hypotheses, data, and theories.
  • Most findings in psychological literature are established and foundational.