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REVIEW 4 major objections 5 minor 48 references

Global p-Values in Multi-Design Studies

T0 review · 4 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read The paper proposes a global p-value, the g-value, that aggregates all p-values from a multi-design study by rescaling the maximum p-value by a calibration constant, so the test keeps asymptotic size α with power close to a single valid…

desk verdict A neat rescaling idea for aggregating p-values, but the flagship analytic example only works for a specific error distribution, and the general algorithm is unvalidated. read the letter →

arxiv 2507.03815 v1 pith:PGIXWWGI submitted 2025-07-04 stat.ME

classification stat.ME MSC 62F0362F4062G10
keywords g-valueglobalp-valuemulti-designstudiesmulti-analystp-hackingselectivereportingtypeIerrorcontrolaggregation
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper argues that the usual response to analytical flexibility—either pick one test or take the most conservative one—is unnecessary. It introduces a global p-value, or g-value, defined as the largest p-value across a pre-specified set of legitimate analysis strategies, rescaled by a constant that depends on the set and on the significance level α. The constant is chosen so that, under the null hypothesis, the asymptotic probability that the g-value falls below α is exactly α. If this holds, a multi-design study can be summarized by one number that controls the false-positive rate, keeps power close to a single well-chosen test, and removes the incentive to report only the smallest p-value.

What carries the argument

The load-bearing object is the calibration constant $\alpha^*(\alpha, \mathcal{A})$, the value $\gamma \in [\alpha, 1]$ at which the asymptotic null probability that all p-values in $\mathcal{A}$ exceed $1-\gamma$ equals $\alpha$. Equivalently, it inverts the null distribution of the largest p-value. In the paper's worked example, the two test statistics have an asymptotic bivariate normal distribution with correlation $\sqrt{3/\pi}$, so the null distribution of the maximum p-value has a closed form and $\alpha^*$ can be computed by a one-dimensional root search. For settings without a closed form, the paper proposes a resampling algorithm—bootstrap resampling of observations followed by permutation of the variable of interest—to approximate the null distribution of the maximum p-value. A quantile variant, replacing the maximum by a $\gamma$-quantile of the p-values, is offered as a robustness adjustment.

What would settle it

Take a small sample, run two analyses on the same variable where one uses a t-test and the other uses a different model specification or a transformation of the outcome, and apply the proposed bootstrap-then-permutation algorithm to compute $\alpha^*$. Under $H_0$ with $\mu = 0$, simulate the empirical rejection rate of $G_n(\mathcal{A}) \le \alpha$ over many replications; if the rate exceeds $\alpha$ by more than simulation error, the claimed size control fails. A second check applies the same simulation to the quantile variant, since the paper does not prove that the max-based $\alpha^*$ remains valid when the statistic is replaced by a quantile.

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Extended reading notes

Core claim

At the paper's center is the decision rule $G_n(\mathcal{A}) = (\alpha/\alpha^*(\alpha,\mathcal{A}))\,\max_{A\in\mathcal{A}} P_n(A)$, where $\alpha^*(\alpha,\mathcal{A})$ solves $\lim_{n\to\infty} \Pr(\max_{A\in\mathcal{A}} P_n(A) \le \gamma \mid H_0) = \alpha$ for $\gamma$. Because the unadjusted maximum p-value is conservative—it rejects only when all tests happen to be significant—the paper rescales it by $\alpha/\alpha^*$, which is equivalent to comparing the largest p-value against the larger threshold $\alpha^*$. The paper proves in a two-test example (one-sample t-test and Wilcoxon rank-sum test) that the asymptotic joint distribution of the test statistics is bivariate normal with correlation $\sqrt{3/\pi}$, computes $\alpha^*(0.05,\mathcal{A}) \approx 0.0601$, and shows by simulation that empirical rejection rates under $H_0$ sit near $0.05$ while power tracks the individual tests rather than the conservative bound.

Load-bearing premise

Everything rests on being able to compute or reliably approximate the null distribution of the maximum p-value over the full set $\mathcal{A}$; if the resampling scheme does not produce a valid null for every analysis strategy simultaneously (for example, when the strategies use different models or transformations), the calibrated constant $\alpha^*$ will not deliver the claimed error control.

Editorial extensions

If this is right

  • A multi-design study can report a single g-value; rejecting $H_0$ when $G_n(\mathcal{A}) \le \alpha$ gives an asymptotic type I error of $\alpha$ regardless of how many strategies are in $\mathcal{A}$.
  • The g-value's power is close to that of the individual valid tests, so the method avoids the large power loss of the most conservative p-value.
  • Because the set $\mathcal{A}$ must be stated in advance, selective reporting of only the most favorable p-value is structurally discouraged.
  • The framework extends to regression and maximum-likelihood settings whenever estimators admit an influence-function representation; for complex cases the bootstrap-permutation algorithm provides a numerical route.
  • The quantile version lets researchers downweight a few poorly fitting analysis choices while retaining the g-value interpretation.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A natural extension not developed in the paper is to apply the same calibration logic to any class of asymptotically normal test statistics, so the g-value could serve as a template for aggregating specification-level effect sizes or confidence bounds.
  • Because the paper deliberately leaves dependent observations out of scope, extending the bootstrap-permutation scheme to time series would require a block-bootstrap or sieve-based null, which is a next step the paper does not take.
  • The requirement to enumerate $\mathcal{A}$ in advance suggests a practical workflow: researchers register the set of analyses before looking at data, then report the g-value; this could be tested as an intervention on reporting behavior.
  • The quantile variant may control size only under stronger assumptions than the maximum variant; a simulation comparing type I error across quantile levels would clarify when it is safe.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper proposes a 'g-value' for multi-design studies: for a pre-specified set A of analysis strategies, one computes the p-value P_n(A) for each strategy, takes the largest p-value, and rescales it by α/α*, where α* is the α-quantile of the null distribution of the maximum p-value. The authors argue that this construction controls the asymptotic type I error at α while avoiding the conservatism of simply reporting the largest p-value, and that it reduces selective reporting by forcing researchers to enumerate A. The method is illustrated with a two-test example involving the one-sample t-test and the Wilcoxon signed-rank test, supported by a small Monte Carlo study, and the paper discusses practical computation via a bootstrap-plus-permutation algorithm and a quantile-based robust variant.

Significance. Conceptually, the g-value is an elegant and appealing idea: instead of aggregating p-values through an arbitrary combination rule, one calibrates the maximum p-value against its true null distribution, thereby turning the most conservative multi-design summary into an exact-level test. If the joint null distribution of the p-values were available, the construction would deliver much of what the abstract promises. The paper also usefully distinguishes its setting from classical multiple testing and selective inference. However, the current manuscript does not establish the required null distribution in any general setting: the analytic example is valid only under additional distributional assumptions, the general resampling algorithm is unvalidated, and the quantile variant as written does not control size. The contribution is therefore a promising framework rather than a demonstrated method.

major comments (4)
  1. [Section 3.1, Eq. (3) and Eq. (4)] The covariance between the normalized t-statistic and the Wilcoxon signed-rank statistic is not universal. From the influence-function representation in Eq. (3), the covariance equals (√3/σ) E[|X_i| G(|X_i|)], which depends on F through G and σ. The value √(3/π) used in Eq. (4) is correct for Gaussian F but not for every symmetric F. For instance, if X_i ~ Uniform(-1,1), then σ=1/√3 and G(x)=x, so the covariance equals 1; the two tests are asymptotically equivalent and the null distribution of max P is Uniform(0,1), so α* should be 0.05, not 0.0601. Consequently, the claim that Example 1 demonstrates asymptotic size α for arbitrary symmetric F is false, and the Section 3.2 simulation, which feeds the normal-based α* into t15 data, does not provide the advertised evidence. The framework itself survives if α* is computed from the correct joint null distribution, but the paper's only analytical demonstration needs either a restriction to a specific F or a derivation of the F-dependent correction.
  2. [Section 4.1 (quantile variant)] The robust g-value G_n(A;γ) replaces max_A P_n(A) by Quantile_γ but keeps the same α* defined in Eq. (2) from the null distribution of the maximum. This does not control type I error: because Quantile_γ ≤ max_A P_n(A) pointwise for γ<1, the event {Quantile_γ ≤ α*} contains {max_A P_n(A) ≤ α*}, so the asymptotic rejection probability is at least α, and generically strictly larger. The quantile variant requires its own calibration constant computed from the null distribution of the quantile statistic.
  3. [Section 4.2 (computation)] The bootstrap-with-replacement followed by permutation proposal is the only general route to α* for arbitrary A, but it is not accompanied by any formal result or simulation. The statement that permutation 'ensures that the null hypothesis holds for all resampled datasets' addresses the marginal validity of each test, not the joint null distribution of the entire vector of p-values under the original data-generating process; for analyses that differ in variable transformations, model specification, or preprocessing, the resampling scheme can alter the dependence structure. As written, the paper provides no evidence that the resampled maximum-p distribution consistently estimates the quantity needed in Eq. (2). A theorem with explicit conditions or a simulation study is required before the general claims in the abstract and conclusion can be accepted.
  4. [Section 2 and Section 5 (scope of claims)] The paper states in the abstract and conclusion that the g-value 'rigorously controls type I error rates' and 'maintains strong statistical power.' These claims are not established for the general setting: no theorem is stated for the existence and uniqueness of α* under the stated regularity conditions, and the power statement is only illustrated in the two-test example. Please restate the guarantees as asymptotic and conditional on a correctly specified null distribution of max_A P_n(A), or prove them under explicit assumptions.
minor comments (5)
  1. [Section 3.1 and Section 3.2] The one-sample procedure used in Example 1 is the Wilcoxon signed-rank test, not the Wilcoxon rank-sum test; the terminology should be corrected.
  2. [Section 3.1] The notation G_n(A) for the g-value collides with the CDF G(·) used in Eq. (3); consider renaming the CDF (e.g., F_{|X|}).
  3. [Section 3.1, Eq. (2)] The notation 'argzero' is non-standard; define it as the unique γ satisfying the displayed equation, and state conditions for existence and uniqueness.
  4. [Section 3.2] With 10^5 Monte Carlo replications, the Monte Carlo standard error of a rejection proportion near 0.05 is about 0.0007; reporting the estimated type I error with this precision or a confidence interval would make the 'close to 0.05' claim quantitative.
  5. [Section 4.2] The 'algorithm' is described only in prose; a step-by-step pseudocode and a discussion of how α* is estimated from the resampled distribution would improve reproducibility.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: the g-value is a calibration rule, and its size control follows from the definition of alpha* rather than from any fitted parameter or load-bearing self-citation.

full rationale

The g-value construction in Eq. (2) is a calibration rule: alpha* is defined as the null quantile of the maximum p-value, so the statement that the rule has asymptotic size alpha is true by construction rather than by an independent theorem. This is normal statistical calibration, not a fitted-input/prediction circularity, because alpha* is not estimated from data and the hard part—computing the joint null distribution of the p-values—is addressed separately (analytically in Example 1, via resampling in Section 4.2). The only self-reference is the citation of Boulaguiem et al. (2024a,b) for the general idea of adjusting conservative procedures; that citation is illustrative, not load-bearing, since the g-value's definition and calibration do not rest on any result from those papers. The analytic example's use of a covariance matrix that is not distribution-free for all symmetric F is a correctness concern about the example, not a circularity: the alpha* used in the simulation is computed from the stated null distribution and then evaluated on t15 data rather than being fit to the t15 simulation. The quantile variant and the permutation/bootstrapping algorithm are under-verified assumptions, but they are not circular: they do not assume the conclusion. Hence no step reduces to its own input in the sense of the circularity checklist.

Assumptions & free parameters 1 free parameters · 5 assumptions · 1 invented entities

The framework is parameter-light: the only user-chosen knob is the quantile level γ in the robust variant, which has no supporting theory. The main burdens are domain assumptions about the set A and the joint null distribution of p-values, with the bootstrap-plus-permutation validity being an ad hoc assertion.

free parameters (1)
  • quantile level γ in robust variant
    Introduced in Section 4.1 for G_n(A;γ) without derivation of its null distribution; the same α* from the max distribution is reused.
assumptions (5)
  • domain assumption The set A of analysis strategies is fixed in advance and chosen independently of the data, and every test in A is asymptotically valid and powerful.
    Stated in Section 2: the size computations assume Pr(A) is not data-dependent; the g-value does not correct for ex post selection of A.
  • domain assumption The limiting joint distribution of the p-values (equivalently test statistics) across A under H0 is known or can be approximated by resampling.
    Required to compute α* in Eq. (2)-(4); for general A the paper proposes bootstrap+permutation in Section 4.2 without proof.
  • standard math The maximum p-value statistic has a continuous, strictly increasing null distribution, so the argzero defining α* exists and is unique.
    Implicit in the definition of α* in Eq. (2); true for continuous p-variables but not stated or proved.
  • ad hoc to paper Bootstrap with replacement followed by permuting the variable of interest yields a valid null distribution for all A∈A simultaneously.
    Section 4.2, last two paragraphs. This is the load-bearing premise for the general algorithm.
  • standard math Estimators in regression settings admit an influence function representation √n(β̂_j−β_j)=Σφ_j(Y_i,x_i,β)+o_p(1).
    Section 4.2, used to justify extending the approach to regression via CLT; holds for MLE under regularity conditions.
invented entities (1)
  • g-value (global p-value)
    purpose: A single summary statistic that aggregates p-values from multiple analyses A by rescaling the largest p-value with α/α*, enabling a size-α decision rule.
    Introduced in Section 3.1, Eq. (2). It is a mathematical construct defined within the paper; its justification is the calibration equation, which is internal rather than external evidence.

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Cite this review

Pith. "Pith review of Global p-Values in Multi-Design Studies." pith.science (2026). https://pith.science/paper/PGIXWWGI

@misc{pith2026250703815,
  author       = {Pith},
  title        = {Pith review of: Global p-Values in Multi-Design Studies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/PGIXWWGI}},
  note         = {Machine review of arXiv:2507.03815}
}
read the original abstract

Replicability issues -- referring to the difficulty or failure of independent researchers to corroborate the results of published studies -- have hindered the meaningful progression of science and eroded public trust in scientific findings. In response to the replicability crisis, one approach is the use of multi-design studies, which incorporate multiple analysis strategies to address a single research question. However, there remains a lack of methods for effectively combining outcomes in multi-design studies. In this paper, we propose a unified framework based on the g-value, for global p-value, which enables meaningful aggregation of outcomes from all the considered analysis strategies in multi-design studies. Our framework mitigates the risk of selective reporting while rigorously controlling type I error rates. At the same time, it maintains statistical power and reduces the likelihood of overlooking true positive effects. Importantly, our method is flexible and broadly applicable across various scientific domains and outcome results.

Figures

Figures reproduced from arXiv: 2507.03815 by the authors.

Figure 1
Figure 1. Performance comparison on simulated data for the testing procedures described [PITH_FULL_IMAGE:figures/full_fig_p010_1.png] view at source ↗

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