reference corpus
A reference corpus is used in keyword extraction and term extraction. A reference corpus can also be used with n-grams. A reference corpus is a corpus to which the focus corpus is compared.
When using the Keywords & Terms tool, a reference corpus is preselected but the user can use a different corpus as a reference corpora. The reference corpus can but does not have to be the same for keywords and for terms.
With n-grams, using the reference corpus option will identify n-grams typical of the focus corpus in comparison with the reference corpus.
see also
