ORIGINAL WORKED REFERENCE

Current missingness is 12/100 = 12%; category share rises from 20% to 35%, a 15-point shift. Labeled error is 10/80 = 12.5% versus 18/60 = 30%. All three case rules alert, but the aggregate data do not establish the cause.

CRITICAL CONDITION
Unlabeled records are not treated as correct predictions and alerts do not claim a proven root cause.

LIMITS
This is an offline CSV monitoring exercise, not a running dashboard, drift significance test or cloud deployment.

This reference is not a learner submission or proof of provider-course completion. See material-verification.json in the production package for actual preparation checks.
