A Cautionary Worked Example: Omitted-Variable Bias in a Pooled Regression on the Classic Iris Dataset

Demonstrates Simpson's paradox in pooled iris regression; shows the negative sepal-width effect is an artifact of omitting species, with formal nested model comparisons and within-species regressions.

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-09-14
DOI
https://doi.org/10.5281/zenodo.22749641
Primary Topic
Morphological variations and asymmetry
Type
preprint
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preprint

A Cautionary Worked Example: Omitted-Variable Bias in a Pooled Regression on the Classic Iris Dataset

Amirhossein MoradiSizkouhi
Zenodo (CERN European Organization for Nuclear Research)
Morphological variations and asymmetry
preprint

A Cautionary Worked Example: Omitted-Variable Bias in a Pooled Regression on the Classic Iris Dataset

Amirhossein MoradiSizkouhi
preprint en

Abstract

Demonstrates Simpson's paradox in pooled iris regression; shows the negative sepal-width effect is an artifact of omitting species, with formal nested model comparisons and within-species regressions.

Zenodo (CERN European Organization for Nuclear Research)
Imam Khomeini International University (IR)
Life in Land
Morphological variations and asymmetry
DOIOpen Access PDFOpenAlex
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A Cautionary Worked Example: Omitted-Variable Bias in a Pooled Regression on the Classic Iris Dataset — Amirhossein MoradiSizkouhi · Zenodo (CERN European Organization for Nuclear Research) (2026) | TGRS Research Map | TGRS