R-Squared Quiz

Master R-squared through practical calculations, model comparisons, graph interpretation, timed challenges, helpful explanations, and detailed reports that reveal your strongest regression skills with confidence.

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Question bank: 173 questions across 8 categories.

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Formula reference

R² = 1 − SSres / SStot
SSres = Σ(y − ŷ)²
SStot = Σ(y − ȳ)²
Adjusted R²
1 − (1 − R²)(n − 1)/(n − p − 1)

Included skills

  • Manual sum-of-squares calculations
  • Training and testing interpretation
  • Adjusted R-squared calculations
  • Model and residual comparisons
  • Graph-based diagnostic reasoning
  • Real-world and ethical scenarios
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