Replication Archive and Audit Trail for: Contestability Precedes Greening — Single-Bidding in High-Carbon Public Procurement
再現アーカイブと監査証跡：競争性は環境化に先行する——高炭素公共調達における一者応札 (AI 翻訳)
Ashuraliyev, Abduxoliq
🤖 gxceed AI 要約
日本語
本論文は、高炭素公共調達における一者応札に関する研究の再現アーカイブと監査証跡を提供する。以前の主張の多くは撤回されたが、透明性改革により一者応札が9～17ポイント減少したという差分の差分析の結果は維持された。データ品質の問題（データの過剰取り込み、無効なサプライヤー識別子）が文書化され、修正された。
English
This paper provides a replication archive and audit trail for a study on single-bidding in high-carbon public procurement. While many earlier claims were retracted due to data errors, a difference-in-differences analysis survived, finding that transparency reform reduced single-bidding by 9-17 percentage points. Data quality issues (over-ingested data, invalid supplier identifiers) are documented and corrected.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の公共調達においても、透明性改革が競争促進と脱炭素化に寄与する可能性がある。ただし、本論文のデータはEUのTEDデータベースに基づいており、日本の調達制度に直接適用する際には制度の違いを考慮する必要がある。また、データ品質の徹底した検証の重要性を示唆している。
In the global GX context
This paper highlights the critical importance of data quality and replication in public procurement research for decarbonization. The surviving result on transparency reducing single-bidding offers a cautious empirical basis for reform, relevant to global initiatives like the WTO Government Procurement Agreement. However, the retracted claims serve as a cautionary tale for policy advice based on incomplete analysis.
👥 読者別の含意
🔬研究者:Provides a detailed example of replication and data correction in procurement-decarbonization research, emphasizing the need for rigorous data handling.
🏢実務担当者:Public procurement officials should note that transparency reforms can reduce single-bidding, but careful implementation and data management are crucial.
🏛政策担当者:Regulators should invest in robust data infrastructures for procurement monitoring and ensure that policy evaluations undergo independent replication.
📄 Abstract（原文）
Version 2 of the replication archive, fully reanalysed and re-titled. The earlier version (Governance Reform Unlocks Decarbonization Dead Zones) was rebuilt after a critical desk review; this version corrects the data and retracts the claims that did not survive scrutiny. Corrections and audit (see Reanalysis_and_Audit_Trail_v2.zip): A corrupted/over-ingested 2018 TED vintage (~25x official contract-award-notice counts) is documented and reconciled; headline results are stable when it is excluded. 54.8% of contracts carried an unusable supplier identifier (placeholder string "nan"); supplier analyses are re-run on valid identifiers only. The carbon premium is a between-sector composition statistic with Moulton-correct (cluster-robust) inference, not a measured emissions effect. RETRACTED: the regression-discontinuity "first stage" (collapses under legally correct year-specific, buyer-type-specific cutoffs); the +65.3% measured-emissions claim (a facility-size artifact, null within size strata); and the governance-gradient reading of the premium (a pre-registered test gives rho=+0.33, the wrong sign). SURVIVING result: a not-yet-treated, coverage-stable difference-in-differences finds transparency reform reduced single-bidding by ~9 to 17 pp (cohort-timing permutation p<=0.06). Contents: corrected manuscript and Supplementary Information (LaTeX + PDF), reanalysis/audit scripts and their JSON outputs, point-by-point response memos, and the original 12.7 GB Data.zip carried over from v1. Code MIT; data derivatives CC-BY-4.0.
🔗 Provenance — このレコードを発見したソース
- Zenodo https://zenodo.org/records/20668774first seen 2026-06-13 04:13:11 · last seen 2026-06-16 04:13:54
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