G4G0-2/AI & Data Mining/Exam Revision/Classification.md

1R

(AV)CTARs

Simple Classification One-Level tree

Tie, make arbitrary choice

Issue with Numerics

• Discretise
  • List values of attribute
  • Sort asc
  • Write class under each value
  • Breakpoints between change in class
  • Interval assigned to majority class
  • Enforce bucket size, if adjacent interval has same class, merge.

Issue with Missing Values

• Assign "missing" as a value
• Treat normally

Issue with Overfitting

• Bucket Enforcement
• Ensure attribute tested is applicable

PRISM