DMCT-NOTES/unit 4/05_Rule_Based_Classification.md

Rule-Based Classification

Rule-Based Classifiers use a set of IF-THEN rules to classify data.

Structure

• Rule: IF (Condition) THEN (Class)
• Example:
  • IF (Age = Youth) AND (Student = Yes) THEN (Buys_Computer = Yes)

Extracting Rules from Decision Trees

• We can easily turn a decision tree into rules.
• Each path from the Root to a Leaf becomes one rule.
• The conditions along the path become the IF part (joined by AND).
• The leaf node becomes the THEN part.

Advantages

• Easy for humans to understand.
• Can be created directly or from other models (like trees).