# Category quality and structure

**Claim grade:** C1-observed
**Audience:** Readers navigating category-level citation and article structure.

## Primary metric

- **Mean category-membership citation count:** 688.7654 membership citations per category row
- Numerator / denominator: 364633788 / 529402
- Estimator: Arithmetic mean across reviewed category rows.
- Uncertainty: Category memberships overlap, so totals are multiplicative rather than distinct.

## Supporting metrics

- **Mean article memberships per category row:** 53.8637 article memberships per category row

## Accessibility fallback

The reviewed category table contains 364633788 citation memberships across 529402 category rows.

## Caveats

- Category membership counts are multiplicative and must not be read as distinct corpus totals.
- The card describes observed category rows without inferring category quality causally.

## Source configs

`categories`