> ## Documentation Index
> Fetch the complete documentation index at: https://docs.medera.info/llms.txt
> Use this file to discover all available pages before exploring further.

# Speech-to-Text Performance Evaluation

> Quantifying and visualizing STT results

Medera ships an STT evaluation harness for measuring word error rate (WER), medical term recognition rate (MTRR), and diarization error rate (DER) on your audio. \`\`\`bash
medera-eval stt \ --audio./eval/audio/ \ --reference./eval/reference/ \ --report./report.html

The harness produces:

* WER overall and per-speaker

* MTRR on your medical lexicon

* DER and DER-aware WER (DA-WER)

* Per-utterance error analysis