Forecasting · The accuracy record · Element
The bias
Whether the error runs consistently in one direction.
The part
What it is
Random error is a limit; systematic bias is a correction waiting to be applied.
Bias frequently differs by line — revenue optimistic, costs optimistic in the other direction — which is more useful than an overall figure.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.