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# RAG precision/recall evaluation
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Chunking**.
> To reorient, go back here:
>
> - [**Chunking** — text segmentation and context window management](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>
A compact, repeatable harness to measure retrieval precision, recall, and coverage after you change chunking, OCR, or indexing. This page also defines ΔS and λ probes so you can gate rollouts with hard numbers.
## Open these first