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arxiv: 2501.19311 · v4 · submitted 2025-01-31 · 📊 stat.ME

The Case for Time in Causal DAGs

Pith reviewed 2026-05-23 04:23 UTC · model grok-4.3

classification 📊 stat.ME
keywords causal DAGstime orderacyclicitytemporal qualificationcomposite variablescausalitydirected graphs
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The pith

Causal DAGs without time are ambiguous and block clear justification of no cycles.

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

The paper argues that standard causal directed acyclic graphs omit any reference to time, which leaves open multiple possible orderings of the variables and therefore multiple possible interpretations of which edges represent causation. Because the authors take it as given that a cause must occur before its effect, the direction and existence of a causal link depend on the chosen time order. Without that order the graph cannot unambiguously encode the claimed causal structure. The same omission also prevents a principled defense of the acyclicity assumption, since cycles become possible or impossible only once time is fixed. The authors therefore introduce composite causal variables that bundle values observed at one or more explicit time points so that temporal qualification is built into the representation itself.

Core claim

Assuming that causes precede effects, causal relationships are relative to the time order, and causal DAGs require temporal qualification. Nontemporal causal DAGs are therefore ambiguous and obstruct justification of the acyclicity assumption. The paper proposes a formalization via composite causal variables that refer to quantities at one or multiple time points and notes that the justification for acyclicity itself changes according to whether the time order permits cycles.

What carries the argument

Composite causal variables that refer to quantities at one or multiple time points, supplying the temporal qualification that turns an otherwise ambiguous graph into a determinate causal claim.

If this is right

  • The justification offered for acyclicity must be stated separately for time orders that allow cycles and those that do not.
  • Any causal interpretation attached to a DAG changes once the time points attached to its variables are made explicit.
  • The range of data sets and domains to which DAG causal models can be applied is restricted by the availability of a consistent time order.

Where Pith is reading between the lines

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

  • Causal discovery procedures that output graphs would need to record or infer the associated time order to produce unambiguous results.
  • Settings with irregularly sampled or asynchronous observations may require a more flexible version of the composite-variable construction.

Load-bearing premise

That every cause must precede its effect in time.

What would settle it

A concrete nontemporal causal DAG together with a demonstration that its causal interpretation is unambiguous and that its acyclicity can be justified without any reference to time order.

Figures

Figures reproduced from arXiv: 2501.19311 by Alberto Su\'arez, Alexander G. Reisach, Antoine Chambaz, Sebastian Weichwald.

Figure 1
Figure 1. Figure 1: Timeline of instantiated aspirin (◦) and headache (◦) variables. It follows from the causal order that the DAG models a time order of aspirin before headache, as shown in Figure 1a, but it is unclear whether it also models the inverse order of headache before aspirin, as shown in Figure 1b. If the DAG is taken to describe only aspirin before headache, then the absence of an effect of H on A follows purely … view at source ↗
Figure 2
Figure 2. Figure 2: Composite aspirin and headache variables referring to quantities at multiple time points. [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Four realizations with their respective timelines along which causal effects unfold. [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Atomic causal DAG. 3.2 A Tale of Two Acyclicities A causal cycle between two variables requires that at least one of them refers to quantities at multiple time points, as established in Remark 1. This has important implications for the justification of the acyclicity assumption (see Definition A.3 for a formal definition of acyclicity). We partition the acyclicity assumption into two separate and individua… view at source ↗
Figure 8
Figure 8. Figure 8: Definition of composite variables and illustrative timeline. [PITH_FULL_IMAGE:figures/full_fig_p020_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: The atomic DAG and cyclic causal directed graph for the variable composition shown in Figure [PITH_FULL_IMAGE:figures/full_fig_p020_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: time 0 ◦ YTy1 7 ◦ XTx 10 ◦ YTy2 (a) Timeline and composition of the unrolled causal variables. YTy1 XTx YTy2 (b) Unrolled time-acyclic causal DAG [PITH_FULL_IMAGE:figures/full_fig_p020_10.png] view at source ↗
Figure 12
Figure 12. Figure 12: An illustration of Example 5. The temporal aggregation of the atomic causal DAG leads to a Bayesian network between composite variables that contains an edge pointing backward in time. The temporal aggregation of the atomic causal DAG in Figure 12a leads to a pairwise causal dependence between XTx and YTy and between YTy and ZTz , but not between XTx and ZTz . Applying the orientation rules in Meek 1995a … view at source ↗
read the original abstract

We make the case for incorporating a notion of time into causal directed acyclic graphs (DAGs). We demonstrate that nontemporal causal DAGs are ambiguous and obstruct justification of the acyclicity assumption. Assuming that causes precede effects, causal relationships are relative to the time order, and causal DAGs require temporal qualification. We propose a formalization via composite causal variables that refer to quantities at one or multiple time points. We emphasize that the acyclicity assumption requires different justifications depending on whether the time order allows cycles. We conclude by discussing implications for the interpretation and applicability of DAGs as causal models.

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 / 1 minor

Summary. The paper claims that nontemporal causal DAGs are ambiguous and obstruct justification of the acyclicity assumption. Assuming that causes precede effects, it argues that causal relationships are relative to time order and thus require temporal qualification. It proposes formalization via composite causal variables referring to quantities at one or multiple time points, emphasizes that acyclicity justifications differ by time order, and discusses implications for DAG interpretation and applicability.

Significance. If the core argument and formalization hold, the work would identify a foundational ambiguity in standard causal graphical models used in statistics, potentially leading to revised modeling practices that explicitly incorporate time to strengthen acyclicity justifications. The composite-variable approach offers a concrete mechanism that could be extended in applied causal inference.

major comments (1)
  1. [Abstract] Abstract (and the central argument): the claim that nontemporal DAGs are ambiguous and that acyclicity requires temporal justification rests entirely on the premise that causes precede effects. No derivation, defense, or discussion of exceptions (simultaneous causation, feedback loops without strict temporal precedence, or relativistic/quantum settings) is indicated, so the necessity of temporal qualification for causal DAGs in general does not follow.
minor comments (1)
  1. The abstract would benefit from a short statement positioning the composite-variable proposal relative to prior temporal extensions of DAGs in the causal inference literature.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed comment. We address it point by point below, clarifying the intended scope of the manuscript.

read point-by-point responses
  1. Referee: [Abstract] Abstract (and the central argument): the claim that nontemporal DAGs are ambiguous and that acyclicity requires temporal justification rests entirely on the premise that causes precede effects. No derivation, defense, or discussion of exceptions (simultaneous causation, feedback loops without strict temporal precedence, or relativistic/quantum settings) is indicated, so the necessity of temporal qualification for causal DAGs in general does not follow.

    Authors: The manuscript explicitly conditions its argument on the assumption that causes precede effects, as stated in the abstract and repeated in the introduction and body. The claims about ambiguity in nontemporal DAGs and the need for temporal qualification to justify acyclicity are developed strictly within this standard framework common to statistical causal inference. The paper does not derive or defend the temporal-precedence assumption itself, nor does it claim necessity outside settings where the assumption holds; exceptions such as simultaneous causation or non-classical physical settings lie beyond the paper's scope. We will revise the abstract and introduction to state this delimitation more explicitly, noting that the argument applies under the stated assumption without extension to general cases. revision: partial

Circularity Check

0 steps flagged

No circularity; argument is self-contained conceptual case resting on explicit premise

full rationale

The paper advances a conceptual argument that nontemporal DAGs are ambiguous under the stated assumption that causes precede effects. No equations, fitted parameters, predictions, or self-citations are invoked in a load-bearing way that reduces the central claim to its own inputs by construction. The premise is declared upfront rather than smuggled in via definition or prior self-work, and the formalization via composite variables is presented as a proposal rather than a derived necessity. This matches the default expectation of a non-circular paper whose reasoning chain does not collapse into self-reference.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The central claim rests on the domain assumption of temporal precedence of causes and introduces composite causal variables as a new construct without independent evidence provided in the abstract.

axioms (1)
  • domain assumption Causes precede effects
    Explicitly invoked in the abstract to establish that causal relationships are relative to time order.
invented entities (1)
  • composite causal variables no independent evidence
    purpose: To refer to quantities at one or multiple time points for formalizing temporal qualification in causal DAGs
    Proposed in the abstract as the mechanism for incorporating time; no independent evidence or falsifiable handle is mentioned.

pith-pipeline@v0.9.0 · 5626 in / 1082 out tokens · 34379 ms · 2026-05-23T04:23:07.356363+00:00 · methodology

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Forward citations

Cited by 1 Pith paper

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    cs.AI 2026-04 unverdicted novelty 6.0

    Collective agency arises when a group's joint actions are faithfully captured by a simpler causal model of unified rational behavior.

Reference graph

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