Consensus Fallback (Reference Derivation)
Without a reference, the majority vote of the appraisers is used as the reference per part; ties leave the part ambiguous.
Also known as: consensus reference, majority-vote reference
The consensus fallback in MSA Type 5 derives the reference category per part from the appraisers' ratings when no external reference column is provided. Aggregation depends on the characteristic type:
Ties (binary/nominal) or a median falling exactly between two steps (ordinal) push the part into and exclude it from all vs-reference metrics (effectiveness, miss/FA rate, κ vs. reference, SDT). κ between appraisers is unaffected.
See also
Used in
Sources
- AIAG: Measurement Systems Analysis Reference Manual, 4th ed., 2010 — Kap. III-C