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Principle of marginality — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Principle_of_marginality
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-15T18:58:51.127Z
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Principle of marginality — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Principle_of_marginality (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_ae87b116ad4e (Metraipolis archive dc_ae87b116ad4e, sha256 c5f621da8844ae6b439ea2678b79d3841124e2590fd4518ea36bacdf39612741)

BibTeX

@misc{dcae87b116ad4e,
  title = {Principle of marginality — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Principle_of_marginality},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_ae87b116ad4e; sha256 c5f621da8844ae6b439ea2678b79d3841124e2590fd4518ea36bacdf39612741},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Principle_of_marginality. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In statistics, the principle of marginality, sometimes called hierarchical principle, is the fact that the average (or main) effects of variables in an analysis are marginal to their interaction effect—that is, the main effect of one explanatory variable captures the effect of that variable averaged over all values of a second explanatory variable whose value influences the first variable's effect. The principle of marginality implies that, in general, it is wrong to test, estimate, or interpret main effects of explanatory variables where the variables interact or, similarly, to model interaction effects but delete main effects that are marginal to them. While such models are interpretable, they lack applicability, as they ignore the dependence of a variable's effect upon another variable's value. Nelder and Venables have argued strongly for the importance of this principle in regression analysis.

Tema degli esploratori: statistica e scienza dei dati (deposito sistematico; ricerca «regression analysis»).
Fonte: Wikipedia in inglese, voce «Principle of marginality» — https://en.wikipedia.org/wiki/Principle_of_marginality
Wikidata Q7245161 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q7245161
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Principle_of_marginality?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1283295112, consultata il 2026-10-15T18:19:47.048Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: e6464711b89e28b7d8880cdcd7fb0eef1a7a4b51f36f693676442fa7260b779a