Extract the most relevant words or phrases in a document. Keywords, which we define as a sequence of one or more words, provide a compact representation of a document’s content. Ideally, keywords represent in condensed form the essential content of a document.
Text-Analysis implements the RAKE (Rapid Automatic Keyword Extraction) algorithm, an unsupervised, domain-independent, and language-independent method for extracting keywords from individual documents.
The RAKE (Rapid Automatic Keyword Extraction) algorithm is described in the book Text Mining: Applications and Theory (Wiley 2010).