2. Vector-Space Models for Information Retrieval

Research in information retrieval has followed several parallel, yet similar, developmental paths. Latent Semantic Indexing (LSI), because of the way it represents terms and documents in a term-document space, is considered a vector-space information retrieval model. In the following sections, general vector-space models as well as LSI are introduced.

• 2.1 Introduction to Vector-Space Models
• 2.2 Latent Semantic Indexing
  • 2.2.1 Term-Document Representation
  • 2.2.2 Weighting
  • 2.2.3 Computing the SVD
  • 2.2.4 Query Projection and Matching
  • 2.2.5 Relevance Feedback