DATA SNAPSHOT · 2026-08-12PCS-1.0 · Crossref-sourced

POSI Citation Score (PCS)

Mean Crossref is-referenced-by-count across every eligible work published in 2022–2025 — a full cursor-paginated fetch, no article-sample cap (PCS-1.0-SPEC.md). The table below is sorted by PCS value, not ranked — see the notice below.

PCS is independently reported and does not determine POSI Citation Rank, Citation Percentile, or Citation Quartile.

PCS reflects citations known to Crossref through its Cited-by and metadata infrastructure. Crossref citation coverage is not exhaustive and may vary across publishers, journals, publication years, and disciplines. PCS therefore represents a Crossref-observed citation indicator, not a complete census of all citations to a work.

Coverage of This Run

4089 of 4320 journals have a computed PCS value.

231 journals show No PCS available — a real, checked outcome (a Crossref-unregistered or stale ISSN, no ISSN on record, or a journal too new for a complete 4-year window), not a zero score. See the full audit for every journal's individual cause.

Source: Crossref REST API, is-referenced-by-count.

Window: 2022–2025 (4 complete publication years).

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Covers the POSI Core Collection and the curated Global Benchmark seed (the same 1023-journal scope as Citation Rankings's Core Collection plus the curated benchmark). Retracted-but-citable works remain in the denominator with their Crossref count unmodified — PCS-1.0-SPEC.md § 10 explains why this differs from PCI's retraction handling.

PCI & PCS Positioning →Citation Rankings (PCI preview) →Ratings Overview →