MMP.14:4.5 - Recalculate the consequence and examine the repair

Recalculate the original discrepancy and the receiving quantity under the revision. Adding a term to an equation leaves both questions unfinished. Show what changes and what remains unchanged.

Compare with the previous model and a serious sufficient alternative on the same available basis. A simpler model can be preferable when its retained result suffices and the added component contributes only estimation noise or cost. A better average score can coexist with a worse consequential tail or subgroup prediction; inspect that conflict directly.

Distinguish repair construction from assessment of the repaired prediction. Reproducing the data that motivated the revision shows what the revision accommodates. An untouched set of suitable existing records can assess a forecast fixed before those records are inspected. When repeated tuning consumes that set, it becomes part of development. If the needed performance claim concerns the whole adaptive procedure, its assessment must include that adaptation, for example through a suitable outer split; it is not a test of one retrospectively selected fit.

Fresh observations are not the only useful continuation. Recalculate with available held-out records, derive the affected consequence, retain a conditional result or restrict use. C.11.DUA determines whether resolving the remaining limitation is worth its cost. Do not describe an unperformed comparison as successful.