Library Science · Information Retrieval Models

Rohit is an information scientist working at a digital library that provides access to thousands of research papers and reports. To improve search accuracy and relevance for users, he decides to implement advanced Information Retrieval (IR) models that rank documents based on user queries. He compares different IR approaches like the Boolean model, Vector Space model, and Probabilistic model. Which of the following statements is/are correct regarding Information Retrieval models in this context? 1. The Boolean model retrieves documents based on exact keyword matching using logical operators like AND, OR, and NOT. 2. The Vector Space model ranks documents based on the similarity between query and document vectors, allowing partial matching. 3. The Probabilistic model estimates the likelihood that a document is relevant to a user's query.