Introduction to Information Retrieval
Introduction to Information Retrieval Introduction to Information Retrieval
Introduction to Information Retrieval Outline ❶ Recap ❷ Why ranked retrieval? ❸ Term frequency ❹ tf-idf weighting ❺ The vector space model 18
Introduction to Information Retrieval Frequency in document vs. frequency in collection • In addition, to term frequency (the frequency of the term in the document) . . . • . . .we also want to use the frequency of the term in the collection for weighting and ranking. 19
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<strong>Introduction</strong> <strong>to</strong> <strong>Information</strong> <strong>Retrieval</strong><br />
Frequency in document vs. frequency in<br />
collection<br />
• In addition, <strong>to</strong> term frequency (the frequency of the term<br />
in the document) . . .<br />
• . . .we also want <strong>to</strong> use the frequency of the term in the<br />
collection for weighting and ranking.<br />
19
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