Fitting the past
DrawingA drawing of the idea, not a real result.
- Wiggly line
- Plain line
Change a rule enough times and one version fits the past very closely.
That is called overfitting. It is like learning last year's exam answers by heart.
In the drawing, the wiggly line passes through every old dot.
On the new dots, which it never saw, it misses by far more. The plain line does better there.
Check it landed
Two quick questions. Nothing is scored or kept.
What is overfitting?
Where does an overfitted rule look worst?
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