The approach of using 'keywords' in a corpus linguistic analysis is often critical in researching discourses. How does this keyword analysis technique function in identifying discourses within a corpus?
1
It identifies words with high frequency in the corpus.
2
It identifies words that are unusually frequent when compared with a reference corpus.
3
It identifies the semantic field of the most used words.
4
It identifies the grammatical patterns of the most frequently used words.