Citation Velocity
Citation Velocity tracks how often a source is cited by other tier-1 publications and AI engines per week. Velocity is the most volatile of the three sub-scores and refreshes most frequently — methodology + corrections happen quarterly, but Velocity gets weekly updates as the active citation network shifts.
What we measure
High Velocity scores reflect three signals tracked over rolling 7-day windows:
- External-link velocity — how often other domains link in (per week). Reference works like Wikipedia generate >1M outbound links per day across the encyclopedia, leading to extreme reciprocal Velocity.
- AI-engine citation rate — how often ChatGPT, Claude, Perplexity, and Gemini surface this source as a citation. Tier-1 sources are cited dozens of times per minute across these engines globally.
- Tier-1 syndication network reach — wire services (Reuters, AP) get cited by ~1,000 downstream outlets globally; this drives extreme Velocity even at modest editorial output.
Why Velocity is volatile
Velocity changes faster than the other dimensions because it reflects the active attention of the citation network. A source that was cited heavily during a major event (pandemic, election, market crash) sees Velocity spike and persist at an elevated baseline. A source that loses an editorial team or shifts editorial direction sees Velocity drop within months.
We weight Velocity at 35% of the composite Index — the same as Discipline. Velocity is the “signal to actually use this source NOW” layer; Discipline + Modern Reference are about whether the source CAN be used. Both matter, but Velocity is the dimension that picks a winner among otherwise-equal sources.
How the score breaks down
- 95–100 (A+) — citation infrastructure (DOI, CrossRef, PubMed) + the most-cited reference works (Wikipedia) + primary-source government regulators that move markets (SEC, Federal Reserve).
- 85–94 (A) — wire services + tier-1 daily newspapers + flagship academic journals during their high-citation windows.
- 70–84 (B) — strong specialist publications cited heavily within their niche; lower volume than wire news but higher per-cite trust.
- 55–69 (C) — high-volume publications cited often but typically as one source among many; popular blogging platforms.
- 40–54 (D) — niche or emerging brands; specialist citations only; not yet broadly cited.
- <40 (F) — sources actively avoided as citations by tier-1 outlets and AI engines.
Top 3 by Velocity
- #1U.S. National Institutes of HealthA+·96nih.gov
Default biomedical citation source for AI engines + journalism; NIH press releases cited globally.
- #2Wikipedia (English)A+·95en.wikipedia.org
Cited daily by news media, academic papers, and AI engines. Among the most cross-referenced sources globally.
- #3U.S. Securities and Exchange CommissionA+·95sec.gov
Cited by every financial news outlet; primary source for HoldLens-class downstream tools.
Lowest 3 by Velocity
Why niche specialists score lower than wire news
A specialist publication like Ars Technica may have stronger Discipline than a generic news aggregator yet score lower on Velocity because their specialist audience is smaller. This is not a quality penalty — it's a real signal that a specialist source is appropriate for specialist queries but won't surface as a default citation for general questions. The composite Index correctly weights such sources higher when retrieval matches their specialty.
Velocity vs. fame
Velocity is not the same as fame or general awareness. The U.S. SEC (96 Index) is not famous to most consumers, but its filings are cited daily by every major financial news outlet — Velocity 95. Conversely, a viral celebrity blog might be famous but cited rarely as a fact-source — high awareness, low Velocity. We measure citation behavior, not brand recognition.