Quad

"Known for: Big Greek life"

Colleges where fraternity and sorority life is a big part of campus get a "Known for: Big Greek life" tag, now that 102 colleges report it.

Complexity
Small

The display module and the partial-coverage guard already exist; left are the top-decile rule, the Known for wiring, and lifting the guard for this one use.

Status
Planned
Source data
Multiple sources
View on GitHub

Status: planned (not built). Needs greek-life.md (built), whose "Known for" section records the threshold this spec exists to act on.

Goal

Give colleges where fraternity and sorority life is a big part of campus a "Known for: Big Greek life" badge, alongside the site's other "Known for" tags (lib/insights.ts), computed from school.reported.greek (lib/cds/greek.ts, lib/cds/greek-display.ts).

Why now

greek-life.md's "Known for" section set KNOWN_FOR_MIN_REPORTERS = 50 (lib/cds/greek-display.ts) as the point at which a top-decile badge would be meaningful rather than noise. That threshold was met 2026-10-10, with 102 colleges reporting an undergrad fraternity-or-sorority percentage (specs/backlog.md tracks the open item). This spec is the build: the rule, the wiring, and lifting the partial-coverage guard for this one new use.

What's already there

  • school.reported.greek.{frat,sor}_pct_undergrad (CDS F1), merged and lineage-cited, with a greek-f1-ratio units-mix-up check — all built (greek-life.md).
  • The profile card, Compare rows, and Explore's participation filter already read these fields.
  • greekReporters/fratMedian/sorMedian (lib/cds/greek-display.ts) already compute over reporting colleges only.
  • A partial-coverage guard (tests/cds-greek.test.mts) that fails if any Greek field reaches lib/insights.ts (where "Known for" badges are computed), METRICS, a rank, a percentile, a median outside greek-display.ts, a sort, or Home facts — this spec's build is the one place that guard must be deliberately, narrowly lifted.

What this build adds

  • The rule: what counts as "Big Greek life" — most likely a top-decile cut on frat_pct_undergrad or sor_pct_undergrad (never their sum, per greek-life.md's Rules) among greekReporters, with a floor so a small reporting pool near the threshold can't crown one college by a fluke. Needs an owner decision on the exact cut and floor, the same way other "Known for" badges were calibrated.
  • The wiring: a case in lib/insights.ts's badge computation, reading reported.greek for reporting colleges only (never inferring anything for non-reporters) and citing the figure the same way the profile card and Compare already do.
  • Lifting the guard: tests/cds-greek.test.mts's partial-coverage guard currently fails the build the moment lib/insights.ts names a Greek field at all. It needs a narrow exception for exactly this one badge, not a blanket removal — the rest of the guard (METRICS, ranks, percentiles, medians, sorts, Home facts) should keep holding.

Complexity

Small: the data, the display module, and the guard tests already exist. What's left is one rule, one badge computation, and one guard exception — no new source, no new profile section.