Similarity-Metrics

• Overlap Coefficient

  Set similarity metric: intersection / smaller set size. Asymmetric variant of Jaccard emphasizing subset containment.

• Jaccard Similarity

  Set overlap metric: intersection / union. Measures similarity of sets without regard to order or duplicates.

• Dice Coefficient

  Set similarity metric: twice shared elements / total elements in both sets. Related to Jaccard but emphasizes intersection differently.

• Cosine Similarity

  Vector similarity metric: dot product / product of magnitudes. Standard measure for dense and sparse vector comparison in IR.