Keyphrases
- information retrieval
- information retrieval systems
- context sensitive
- question answering
- document collections
- search engine
- test collection
- query expansion
- vector space model
- information access
- learning to rank
- text mining
- information extraction
- socio economic
- latent semantic indexing
- relevance feedback
- data sets
- health informatics
- tf idf
- database
- retrieval model
- health care
- language model
- real time