Months it never saw
DrawingA drawing of the idea, not a real result.
The fairest check is on prices the rule never saw.
One way is to set the newest months aside while trying versions of the rule.
When you have finished, the rule runs on those months once.
Those months played no part in any change. So tuning could not bend them.
Revising from old exam papers, then sitting one you have never seen. Only the paper you have not seen shows what you learned.
Check it landed
Two quick questions. Nothing is scored or kept.
Why set the newest months aside?
You change the rule after seeing those months. Are they still unseen?
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