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Your model is accurate on average but fails badly for one subgroup. How do you find and fix it?

A 92% aggregate accuracy can hide 60% on the segment that matters most. Average metrics are exactly where these failures hide. Here is how to surface them and the menu of fixes that actually map to the cause.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A 92% aggregate accuracy can hide 60% on the segment that matters most. Average metrics are exactly where these failures hide. Here is how to surface them and the menu of fixes that actually map to the cause.

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