Deterministic engine (item response theory, reliable change index, cumulative sum, stable band)

Role

Scoring and change detection

Status

In use

Version

engine 0.9.3

Licence

Ours, proprietary (all rights reserved)

Runs where

Our server

Formulas, norms GCC-prior-1, assumed reliability 0.82 (literature). Simulated test-retest 0.73

Boundaries

• Never decides a referral. A clinician does.
• Switchable off from the trust centre. The product falls back to approved templates.
• Changes need a new version, a re-run of make eval, and sign-off before release.