Introduction to Information Retrieval

Introduction to Information Retrieval
Exercise: Term, collection and document
frequency
Quantity
term frequency
document frequency
collection frequency
Symbol Definition
tf t,d
df t
cf t
number of occurrences of t in
d
number of documents in the
collection that t occurs in
total number of occurrences of
t in the collection
• Relationship between df and cf?
• Relationship between tf and cf?
• Relationship between tf and df?
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