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Why internal validity is not prior to external validity

Publication Date
  • Causation
  • Confirmation/Induction
  • Experimentation
  • Psychology/Psychiatry
  • Philosophy


We show that the common claim that internal validity should be understood as prior to external validity has, at least, three epistemologically problematic aspects: experimental artefacts, the implications of causal relations, and how the mechanism is measured. Each aspect demonstrates how important external validity is for the internal validity of the experimental result

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