co-occurrence

In linguistics, co-occurrence or cooccurrence is an above-chance frequency of ordered occurrence of two adjacent terms in a text corpus. Co-occurrence in this linguistic sense can be interpreted as an indicator of semantic proximity or an idiomatic expression. Corpus linguistics and its statistic analyses reveal patterns of co-occurrences within a language and enable to work out typical collocations for its lexical items. A co-occurrence restriction is identified when linguistic elements never occur together. Analysis of these restrictions can lead to discoveries about the structure and development of a language.{{cite book|last=Kroeger|first=Paul|title=Analyzing Grammar: An Introduction|year=2005|publisher=Cambridge University Press|location=Cambridge|isbn=978-0-521-01653-7|pages=20|url=https://books.google.com/books?id=rSglHbBaNyAC}}

Co-occurrence can be seen an extension of word counting in higher dimensions. Co-occurrence can be quantitatively described using measures like a massive correlation or mutual information.