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Article

Diagnosing and responding to violations in the positivity assumption.

Statistical methods in medical research - 1 Feb 2012

Petersen Maya L, Porter Kristin E, Gruber Susan, Wang Yue, van der Laan Mark J

Abstract excerpt

The assumption of positivity or experimental treatment assignment requires that observed treatment levels vary within confounder strata. This article discusses the positivity assumption in the context of assessing model and parameter-specific identifiability of causal effects. Positivity violatio...

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Identifiers

PMID: 21030422
DOI: 10.1177/0962280210386207
PMCID: PMC4107929

Provenance

PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 2 Sept 2026. Prepared record publication-21030422-2026-09-02.2. Manifest publication-graph-cohort-2026-09-02.2.

Source receipt: PubMed via Helena Literature Corpus, retrieved 2 Sept 2026.

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