# Phase 1 — Bibliographic corpus (v2, 2026-11-03 18:00 ET)

Generated from `data/metadata/prisma_counts.json` and `linkage_report.json` (corpus v2 = snapshot pass 1 + id-set pass 2).

## Identification
| Source | Records |
|---|---|
| OpenAlex works loaded (CS-topic filter 2018–2026 + DBLP/arXiv-linked second pass) | 16,592,966 |
| DBLP 2018–2026 | 4,347,365 |
| arXiv cs created 2018–2026 | 890,852 |
| ACL Anthology 2018–2026 | 85,625 |

## Linkage
| Link | Count |
|---|---|
| DBLP → OpenAlex by DOI | 3,639,848 |
| DBLP → OpenAlex by title+year (+ first author) | 141,062 |
| DBLP records linked (distinct) | 3,774,184 (86.8 %) |
| DBLP records without any OpenAlex record | 573,181 |
| arXiv → OpenAlex (id / DOI / title) | 914,406 / 783 / 1,768 → 864,677 distinct (97.1 %) |
| ACL → OpenAlex | 73,054 |

## Eligibility (sequential)
| Stage | Records |
|---|---|
| e1_outside_window | 59,453 |
| e2_type | 3,994,472 |
| e3_xpac | 1,430,851 |
| e4_no_title | 1,193 |
| e5_duplicate | 114,421 |
| e7_generic_deposit | 473,549 |
| After exclusions | 10,519,027 |
| **CS core — mapping corpus** | **7,110,289** |
| CS penumbra (sensitivity) | 3,402,475 |
| Strict core (DBLP ∧ primary CS) | 1,832,623 |

Periods: baseline 3,404,397, post 3,704,028. Date precision: month 5,703,718, year-only 1,406,571.
Membership of the core: DBLP 3,608,016, primary CS 5,322,535, arXiv-linked 802,308, abstracts 5,385,235, with references 4,614,417, retracted (flagged) 17,094.
Preprint→published merges: {'arxiv_id': 13175, 'title_year': 84776}.
By year: {'2018': 642661, '2019': 695209, '2020': 708854, '2021': 710953, '2022': 699308, '2023': 784990, '2024': 901406, '2025': 1065569, '2026': 901339}.

Known limitations: 2026 incomplete (snapshot 2026-10-14; API increment to 2026-11-02 ingested separately); 573 k DBLP records have no OpenAlex record (counted in `dblp_only_counts.csv`, not in the corpus); year-only dates (YYYY-01-01) excluded from monthly series; OpenAlex `created_date` unusable for indexing lag.