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arxiv: 2605.13430 · v1 · submitted 2026-05-13 · 📊 stat.ME · cs.AI· cs.LG

Recognition: 2 theorem links

· Lean Theorem

Towards a holistic understanding of Selection Bias for Causal Effect Identification

Filip Kovacevic, Francesco Locatello, Peter Spirtes, Shimeng Huang, Yiwen Qiu

Authors on Pith no claims yet

Pith reviewed 2026-05-14 19:20 UTC · model grok-4.3

classification 📊 stat.ME cs.AIcs.LG
keywords selection biasaverage treatment effectcausal identifiabilitypropensity scoreselection probabilityobservational studiescausal inference
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The pith

Necessary and sufficient conditions identify the average treatment effect under selection bias via weak assumptions on probability classes.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper investigates the identifiability of the average treatment effect when observational data suffer from selection bias, such as healthy volunteer effects in biobank studies that make the sample unrepresentative of the target population. It derives necessary and sufficient conditions for recovering the population ATE from the selected sample by characterizing the propensity score and selection probability. These conditions rely on weak assumptions about the classes of probability distributions involved. A sympathetic reader would care because selection bias is ubiquitous in real observational data and prior graphical criteria often fail to guarantee identification, so weaker conditions expand the set of recoverable causal effects.

Core claim

We provide necessary and sufficient conditions for ATE identifiability, leveraging weak assumptions on probability classes to characterize propensity score and selection probability. Compared to previous works, our results extend existing graphical identifiability criteria and offer a more comprehensive understanding of causal effect identification with strictly weaker conditions in the presence of selection bias.

What carries the argument

The necessary and sufficient identifiability conditions obtained by characterizing the propensity score and selection probability under weak assumptions on probability classes.

If this is right

  • The population ATE can be recovered from data drawn only from a selected subpopulation whenever the derived conditions are satisfied.
  • Selection bias need not preclude causal identification even when standard graphical criteria are violated.
  • Propensity-score and selection-probability characterizations become available under assumptions weaker than those required by prior graphical methods.
  • Causal-effect estimation algorithms can be built directly on the new characterizations for practical use with biased samples.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same probability-class approach may extend to identifiability questions involving other forms of bias such as confounding or measurement error.
  • Practical checks for the conditions could be implemented via flexible nonparametric estimators of the propensity and selection functions.
  • Study-design recommendations could follow for minimizing the severity of selection bias so that the new conditions are more likely to hold.
  • The framework may connect to existing results on transportability of causal effects across populations.

Load-bearing premise

Weak assumptions on the classes of possible probability distributions are enough to characterize the propensity score and selection probability.

What would settle it

A concrete causal structure and joint distribution in which the stated conditions hold yet the population ATE cannot be recovered from the selected sample, or in which the ATE is recoverable but the conditions fail.

Figures

Figures reproduced from arXiv: 2605.13430 by Filip Kovacevic, Francesco Locatello, Peter Spirtes, Shimeng Huang, Yiwen Qiu.

Figure 1
Figure 1. Figure 1: Illustration of selection bias in estimating the ATE of a physical activity subsidy (T) on cardiovascular health (Y ). The participation into the survey is influenced by SES, which creates a selection bias that can lead to incorrect estimates of the ATE (ATEobs ≪ ATEall) if not properly accounted for. This work aims to address the challenges posed by selection bias in causal inference. We propose a novel f… view at source ↗
Figure 2
Figure 2. Figure 2: Comparison of ATE Estimation under different noise distributions and function types, when both deterministic and non￾deterministic selection are applied. We present results for additive Gaussian and Laplace noise, and extend beyond additive noise to multiplicative noise. Overall, we observe that vanilla application of IPW leads to significantly biased estimates, while our approaches significantly improve, … view at source ↗
Figure 3
Figure 3. Figure 3: ATE estimation results on All of Us dataset. Our ap￾proach significantly decreases the bias, but not entirely. We suspect this is due to the complexity of this real-world distribution, e.g., low propensity scores (∼ 0.05), which makes the overlap very weak and leads to challenging estimation. In particular, we retrieve the last recorded BMI and T2D diagnosis status from each individual. We consider the val… view at source ↗
Figure 4
Figure 4. Figure 4: Visualization of estimated data distributions. Finally, the conditional mean is computed as the expected value under this discrete distribution: µˆ(x) = X M j=1 yj · pˆ(yj |x) (D.17) D.3.2. GAUSSIAN MIXTURE MODEL (ANALYTICAL SOLUTION) The GMM estimates the joint density p(x, y) as a mixture of K Gaussian components with parameters πk, µk , Σk. We compute the conditional expectation analytically. Let the pa… view at source ↗
Figure 5
Figure 5. Figure 5: Additional results for Log-Log-Normal noise distribution. 26 [PITH_FULL_IMAGE:figures/full_fig_p026_5.png] view at source ↗
read the original abstract

Selection bias is pervasive in observational studies. For example, large scale biobanks data can exhibit ``healthy volunteer bias'' when respondents are healthier and of higher socio-economic status than the population they are meant to represent. Recovering causal effects from such sub-population is an important problem in causal inference, as estimating average treatment effects (ATE) from selected populations can result in a severely biased estimate of the ATE from the whole population. In this paper, we investigate the identifiability of the ATE under selection bias. We provide necessary and sufficient conditions for ATE identifiability, leveraging weak assumptions on probability classes to characterize propensity score and selection probability. Compared to previous works, our results extend existing graphical identifiability criteria and offer a more comprehensive understanding of causal effect identification with strictly weaker conditions in the presence of selection bias.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript investigates identifiability of the average treatment effect (ATE) under selection bias, using examples such as healthy volunteer bias in biobanks. It claims to supply necessary and sufficient conditions for ATE identifiability by leveraging weak assumptions on probability classes that characterize the propensity score and selection probability. These conditions are asserted to extend existing graphical identifiability criteria while employing strictly weaker assumptions in the presence of selection bias.

Significance. If the claimed necessary and sufficient conditions are rigorously established, the work would advance causal inference by providing a more general characterization of ATE recovery from selected subpopulations. This could broaden the scope of identifiable causal effects beyond current graphical criteria, with direct relevance to observational data in epidemiology and social sciences where selection mechanisms are common.

major comments (1)
  1. [Abstract] Abstract: The central claim of necessary and sufficient conditions for ATE identifiability rests on 'weak assumptions on probability classes' that characterize the propensity score and selection probability, yet no explicit definitions of these probability classes, theorem statements, derivations, or counterexamples are supplied. This absence prevents verification that the conditions are indeed strictly weaker than prior graphical criteria or that they are load-bearing for identifiability.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their review and for highlighting the need for clarity on our central claims. We address the major comment point by point below.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The central claim of necessary and sufficient conditions for ATE identifiability rests on 'weak assumptions on probability classes' that characterize the propensity score and selection probability, yet no explicit definitions of these probability classes, theorem statements, derivations, or counterexamples are supplied. This absence prevents verification that the conditions are indeed strictly weaker than prior graphical criteria or that they are load-bearing for identifiability.

    Authors: We agree that the abstract is a high-level summary and does not contain the full technical details, which is standard practice to maintain brevity. The explicit definitions of the probability classes (characterizing the propensity score and selection probability under our weak assumptions), the necessary and sufficient conditions, their theorem statements, derivations/proofs, and counterexamples demonstrating that the conditions are strictly weaker than prior graphical criteria are all provided in the main body of the manuscript. Specifically, these appear in Sections 3 (definitions and setup), 4 (main theorems on ATE identifiability), and 5 (comparisons to graphical criteria with counterexamples). This structure allows full verification of the claims. revision: no

Circularity Check

0 steps flagged

No significant circularity detected in derivation chain

full rationale

The paper states necessary and sufficient conditions for ATE identifiability under weak external assumptions on probability classes that characterize propensity and selection probabilities. These assumptions are introduced as independent inputs from probability theory rather than being fitted or defined in terms of the target identifiability result. No equations or steps in the provided material reduce the claimed conditions to self-referential fits, self-citations that bear the full load, or renamings of prior results. The extension of graphical criteria rests on these stated assumptions without circular reduction, making the derivation self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on weak assumptions about probability classes used to characterize propensity and selection probabilities; no free parameters or invented entities are mentioned.

axioms (1)
  • domain assumption Weak assumptions on probability classes suffice to characterize propensity score and selection probability
    Invoked to obtain necessary and sufficient conditions for ATE identifiability under selection bias.

pith-pipeline@v0.9.0 · 5453 in / 1092 out tokens · 31622 ms · 2026-05-14T19:20:22.430075+00:00 · methodology

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