Section 1 — What you will learn
✓ By the end you will understand
- Precision: out of all “YES”, how many were truly correct?
- Recall: out of all real “YES”, how many did we catch?
- False Positive: door said YES to a bad item (oops).
- False Negative: door said NO to a good item (missed).
- Trade-off: stricter door ↑Precision but ↓Recall (often).
Section 2 — Controls
Same concept, Challenge adds scoring + “Win” fireworks.
Lower threshold → catch more good (higher Recall) but also catch more bad (lower Precision).
When positives are rare, false positives can hurt Precision a lot.
Low skill = scores overlap → trade-off becomes painful.
Slow it down if you want to read every decision.
How to play: Start the stream, then move the Threshold slider. Watch which box (TP/FP/FN/TN) lights up after each item.
The big strip above the arena tells you the meaning of each decision.
The big strip above the arena tells you the meaning of each decision.
Section 3 — Live stats
Precision
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Recall
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TP / FP
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FN / TN
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F1 Score
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Total Passed
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Section 4 — Math (simple)
What the gate is calculating
Live formulas
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🧠 Kid Coach
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Tip: Watch the big decision strip above the arena.
Section 5 — The Playground
Hover controls • Click inside arena to interact
Live explanation
Do an action → I’ll explain what changed and why.