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Definition

The quasi-constant features test allows you to specify if a certain feature is expected to be near-constant (low variance) or not.

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Taxonomy

  • Category: Integrity.
  • Task types: Tabular classification, tabular regression.
  • Availability: and .

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Why it matters

  • Quasi-constant features have very low variance and tend to not be as useful for models.
  • If a feature shouldn’t be quasi-constant but is, you might want to re-normalize it.

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Test configuration examples

If you are writing a tests.json, here are a few valid configurations for the character length test:

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Predictive power score (PPS)Quasi-constant feature count