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Managing Outliers, Noise, and Bias

MediumMachine Learning00:00
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Your question is Managing Outliers, Noise, and Bias. Take a moment with it on the right.

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Problem

Scenario

You are reviewing a supervised learning pipeline and notice that model quality changes a lot across retrains. Some of the instability appears to come from bad records, noisy labels, and uneven performance across groups.

Question

How would you actively identify and manage data issues such as outliers, noise, and biases?

Representative Dataset

size·240K loan applications, 62 featurestarget·Default within 12 monthsfeatures·Numerical, categorical, and ratio featuresmissing_data·8% overall, concentrated in self-reported fieldsclass_balance·11.5% positive

What You Need to Detect

  • Outliers from impossible values and extreme but valid cases
  • Feature noise from bad joins, stale values, and inconsistent units
  • Label noise from delayed outcomes or manual review errors
  • Bias from representation gaps and unequal model performance across groups