Term Frequency - Inverse Document Frequency (TD/IDF)
Basic
Tutorial on Information Retrieval
Entry level university class tutorial that assumes some mathematical
familiarity, but which includes a fairly clear explanation of
TF/IDF.
Understanding
Inverse Document Frequency
Paper from Microsoft Research, Cambridge, authored by Stephen
Robertson. (PDF Document)
Using
TF-IDF to Determine Word Relevance in Document Queries
Paper at Rutgers University, authored by Juan Ramos. (PDF - 4
pages)
Query
Expansion for Short Queries by Mining User Logs
Paper examines short vs. long user search queries and discusses
expansion techniques, including tf*idf (Term Frequency & Inverse
Document Frequency.
From Microsoft Research.
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