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arxiv: 2405.03063 · v2 · submitted 2024-05-05 · 🧮 math.ST · cs.IT· cs.LG· math.IT· stat.ME· stat.ML· stat.TH

Stability of a Generalized Debiased Lasso with Applications to Resampling-Based Variable Selection

Pith reviewed 2026-05-24 01:02 UTC · model grok-4.3

classification 🧮 math.ST cs.ITcs.LGmath.ITstat.MEstat.MLstat.TH
keywords debiased lassostabilityvariable selectionresamplingconditional randomization testknockoff filterhigh-dimensional statisticsproportional regime
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The pith

A stability-based update to the generalized debiased Lasso approximates the estimator accurately for all but a vanishing fraction of coordinates under sub-Gaussian designs.

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

The paper proposes a generalized debiased Lasso estimator defined through a stability principle. When one column of the design matrix is perturbed, the estimator admits a simple update formula computed directly from the original solution. Under sub-Gaussian designs with well-conditioned covariance in the proportional growth regime, this approximation is asymptotically accurate for all but a vanishing fraction of coordinates. The result matters because it cuts the cost of repeated estimations in resampling procedures for variable selection. The proof relies on concentration and anti-concentration bounds, while establishing full distributional limits such as Gaussianity remains open under the same conditions.

Core claim

A generalized debiased Lasso estimator based on a stability principle admits a simple update formula when a single column of the design matrix is perturbed. Under sub-Gaussian designs with well-conditioned covariance, in the proportional growth regime, the approximation is asymptotically accurate for all but a vanishing fraction of coordinates. The proof uses concentration and anti-concentration arguments to control error terms and sign changes, while comparable distributional limits remain open.

What carries the argument

The stability principle that supplies a simple update formula for the generalized debiased Lasso when one design column is perturbed.

If this is right

  • The approximation significantly reduces the computational cost of resampling-based variable selection procedures.
  • It applies to the conditional randomization test.
  • It supports a local knockoff filter.
  • The stability approximation holds in settings where full Gaussian distributional limits are still open.

Where Pith is reading between the lines

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

  • Similar stability updates might be constructible for other high-dimensional penalized estimators beyond the Lasso.
  • The cost reduction could extend to other resampling schemes such as bootstrap or cross-validation in high dimensions.
  • Numerical checks in finite samples could test how quickly the vanishing fraction disappears as n grows.
  • The gap between stable approximation and open distributional limits suggests stability may be provable under weaker conditions than full asymptotics.

Load-bearing premise

The design matrix satisfies sub-Gaussian tail bounds and has a well-conditioned covariance matrix, with analysis restricted to the proportional growth regime.

What would settle it

A sub-Gaussian design matrix with well-conditioned covariance for which the stability approximation error fails to vanish for a non-vanishing fraction of coordinates when p/n approaches a constant.

Figures

Figures reproduced from arXiv: 2405.03063 by Jingbo Liu.

Figure 1
Figure 1. Figure 1: Comparison of βˆ (j)U j (cross) and its approximation error βˆ (j)U j −γ˜j (circle) for ρ = 0. have Σ = 1 apϵ  I − ϵ−1 1+ϵ−1p E  . We then generate α with a random set of s coordinates equal to Aval/ √ n (Aval > 0 being a parameter to be specified), and the rest coordinates equal to 0. The observation is Y = Aα + w, where w ∼ N (0, σI). We compare the performance of 6 variable selection methods in [PITH… view at source ↗
Figure 2
Figure 2. Figure 2: Comparison of βˆ (j)U j (cross) and its approximation error βˆ (j)U j −γ˜j (circle) for ρ = 0.5. As s = 20 is relatively small in this setting, there are a few instances of FDR overflow for Knockoff-db, due to fluctuations. Meanwhile, the power achieved by the local knockoff filter and CRT are better than the knockoff filter, with or without debiasing. In [PITH_FULL_IMAGE:figures/full_fig_p065_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Comparison of βˆ (j)U j (cross) and its approximation error βˆ (j)U j −γ˜j (circle) for ρ = 0.95. close to E (the matrix consisting of 1’s), the knockoff filter fails in the high-dimensional limit, regardless of the choice of the knockoff mechanism, whereas methods based on more relaxed local exchangeability conditions (such as local knockoff and CRT) remains powerful. H.4 FDR control with Riboflavin data … view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of βˆ (j) j (cross) and its approximation error (circle) for ρ = 0. we use the best linear estimator A:\jΣ −1 \j Σ\jj for the µ:j in the definition of the debiased estimator. The FDR and power cannot be precisely evaluated since we do not know the ground truth. To tackle this issue, we first use cross-validated Lasso to obtain α for the observed Y , and then generate new Y = Aα + w, where the no… view at source ↗
Figure 5
Figure 5. Figure 5: Comparison of βˆ (j) j (cross) and its approximation error (circle) for ρ = 0.5. vector. For this dataset, we have n = 2026, p = 163, and sparsity level s = 79. For the knockoff function, we use the implementation from the official package. The results are shown in [PITH_FULL_IMAGE:figures/full_fig_p068_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Comparison of βˆ (j) j (cross) and its approximation error (circle) for ρ = 0.95. I Proofs and implementation details for variable se lection I.1 Proof of Lemma 11 Set a = √ 1 2 S 1/2 e where e = (1, . . . , 1)⊤. From ∥s∥1 = s ⊤S −1 s ≥ 1 2 s ⊤Es = 1 2 ∥s∥ 2 1 we obtain ∥a∥ 2 = 1 2 ∥s∥1 ≤ 1. Moreover, (I − 1 2 S 1/2ES1/2 ) −1 = (I − aa⊤) −1 (276) = I + 1 1 − ∥a∥ 2 2 aa⊤. (277) 69 [PITH_FULL_IMAGE:figures/… view at source ↗
read the original abstract

We propose a generalized debiased Lasso estimator based on a stability principle. When a single column of the design matrix is perturbed, the estimator admits a simple update formula that can be computed from the original solution. Under sub-Gaussian designs with well-conditioned covariance, this approximation is asymptotically accurate for all but a vanishing fraction of coordinates in the proportional growth regime. The proof relies on concentration and anti-concentration arguments to control error terms and sign changes. In contrast, establishing comparable distributional limits (e.g., Gaussianity) under similar assumptions remains open. As an application, we show that the approximation significantly reduces the computational cost of resampling-based variable selection procedures, including the conditional randomization test and a local knockoff filter.

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

0 major / 1 minor

Summary. The manuscript proposes a generalized debiased Lasso estimator grounded in a stability principle. When a single column of the design matrix is perturbed, the estimator admits a simple update formula that can be computed from the original solution. Under sub-Gaussian designs with well-conditioned covariance, this approximation is asymptotically accurate for all but a vanishing fraction of coordinates in the proportional growth regime. The proof relies on concentration and anti-concentration arguments to control error terms and sign changes. As an application, the approximation significantly reduces the computational cost of resampling-based variable selection procedures, including the conditional randomization test and a local knockoff filter.

Significance. If the central asymptotic accuracy result holds, this work provides a computationally efficient method for approximating the debiased Lasso under column perturbations, which has direct implications for scalable resampling-based inference in high dimensions. The approach leverages standard concentration tools in a novel way for stability updates. The authors' note that stronger distributional limits remain open demonstrates appropriate caution. This contributes to the field by offering practical speedups without sacrificing the core statistical properties under the stated assumptions. The manuscript includes applications to established procedures like CRT and knockoffs, enhancing its relevance.

minor comments (1)
  1. [Abstract] Abstract: A brief parenthetical reference to the specific concentration inequalities employed in the proof would help readers quickly gauge the technical level.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary, significance assessment, and recommendation to accept the manuscript. We appreciate the recognition of the stability-based update formula, its asymptotic accuracy under the stated assumptions, and the computational benefits for resampling procedures such as the CRT and local knockoffs.

Circularity Check

0 steps flagged

No significant circularity; derivation self-contained via concentration arguments

full rationale

The paper derives the stability-based update formula and its asymptotic accuracy from concentration and anti-concentration inequalities applied to sub-Gaussian designs in the proportional regime. No step reduces a claimed prediction or result to a fitted parameter, self-definition, or load-bearing self-citation. The update is presented as following directly from the perturbed Lasso solution, with error control shown via standard tail bounds rather than by construction or renaming. The abstract explicitly flags that stronger limits like Gaussianity remain open, confirming the argument does not smuggle in its own conclusion. This is the normal case of an independent derivation.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard high-dimensional statistics assumptions rather than new free parameters or invented entities.

axioms (2)
  • domain assumption Design matrix entries are sub-Gaussian with well-conditioned covariance
    Invoked to guarantee the asymptotic accuracy of the stability approximation.
  • domain assumption Proportional growth regime (p/n → constant)
    Required for the vanishing-fraction accuracy statement.

pith-pipeline@v0.9.0 · 5656 in / 1249 out tokens · 23810 ms · 2026-05-24T01:02:16.748375+00:00 · methodology

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