{
  "creator": [
    "Schweizer, Geoffrey",
    "Köppel, Maximilian"
  ],
  "date": [
    "2025-08-29"
  ],
  "description": [
    "We suggest that psychological research into interaction effects might benefit from analyzing potential interactions from the perspective of the Positive Predictive Value (PPV). The PPV denotes the post-study probability that a claimed effect is true, based on the pre-study probability that said effect exists, the power of the respective test and the significance level used for testing. We use the PPV in order to propose a framework structuring potential interaction effects based on their (theoretical) plausibility and their shape. Specifically, the position of a hypothesized interaction in the proposed framework may inform sample-size planning and the choice of alpha levels prior to a study; and it may inform confidence into results after a study. Finally, we present a heuristic approach for planning research on interactions based on R (the pre-study probability that an effect exists), the PPV (the post-study probability that a claimed effect is true) and α (the significance level used for significance testing). In doing so, we aim to provide a nuanced view on the feasibility of investigating into interactional hypotheses, a view that is critical where needed but that at the same time does not discourage research on interactions."
  ],
  "format": [
    "application/pdf",
    "text/html",
    "text/xml"
  ],
  "identifier": [
    "https://ejop.psychopen.eu/index.php/ejop/article/view/14957",
    "10.5964/ejop.14957"
  ],
  "language": [
    "eng"
  ],
  "publisher": [
    "PsychOpen GOLD / Leibniz Institut for Psychology (ZPID)"
  ],
  "relation": [
    "https://ejop.psychopen.eu/index.php/ejop/article/view/14957/14957.pdf",
    "https://ejop.psychopen.eu/index.php/ejop/article/view/14957/14957.html",
    "https://ejop.psychopen.eu/index.php/ejop/article/view/14957/14957.xml"
  ],
  "rights": [
    "Copyright (c) 2025 Geoffrey Schweizer, Maximilian Köppel",
    "https://creativecommons.org/licenses/by/4.0"
  ],
  "source": [
    "Europe’s Journal of Psychology; Vol. 21 No. 3 (2025); 249-262",
    "1841-0413",
    "10.5964/ejop.v21i3"
  ],
  "subject": [
    "replicability",
    "positive predictive value",
    "power",
    "prior probability",
    "pattern of means"
  ],
  "title": [
    "In Search of the Lost Interaction: A Theoretical and Methodological Framework for Researching Interactions"
  ],
  "type": [
    "info:eu-repo/semantics/article",
    "info:eu-repo/semantics/publishedVersion"
  ]
}