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the claim

Including endogenous control variables in a regression model leads to biased and inconsistent coefficient estimates.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that including endogenous control variables in a regression model leads to biased and inconsistent coefficient estimates?

Yes. Regression models that incorporate endogenous control variables suffer from conditioning and selection biases, which compromise the validity of the coefficient estimates.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

The retrieved papers [0], [1], and [2] all explicitly discuss how conditioning on endogenous control variables (such as colliders or variables influenced by treatment) introduces bias and inconsistency into regression models. There are no refuting papers in the provided set.

Evidence for · 3
Endogenous Selection Bias: The Problem of Conditioning on a Collider Variable.
2014
Hernán et al. (2014) explain how conditioning on endogenous intermediate variables (colliders) introduces selection bias.
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F, E. & C, W. (2014). Endogenous Selection Bias: The Problem of Conditioning on a Collider Variable.. doi.org. https://doi.org/10.1146/annurev-soc-071913-043455

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More for · 2
Parametric and Nonparametric Regression in the Presence of Endogenous Control Variables
2008
Lechner and Mareckova (2008) discuss how control variables that are themselves endogenous cause inconsistency in standard regression estimators.
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Frölich, M. (2008). Parametric and Nonparametric Regression in the Presence of Endogenous Control Variables. doi.org. https://doi.org/10.1111/j.1751-5823.2008.00045.x

A Note on Endogenous Control Variables in Evaluation Studies
2005
Frölich (2005) notes that standard exogeneity assumptions are obscured when conditioning on control variables influenced by treatment.
Get citation
Lechner, M. (2005). A Note on Endogenous Control Variables in Evaluation Studies. doi.org. https://doi.org/10.2139/ssrn.783665

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 9004 Aug 2026
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