Principal phrase mining: an automated method for extracting meaningful phrases from text

Text mining is generally used to provide structure to texts by extracting words and provide summary information related to it. This can be improved by extracting commonly occurring phrases instead, which provide more specific information. For example, knowing that the word 'valuable' occurs 5 times in a text gives some information, but knowing that it is actually the phrase 'not valuable' that appears 5 times is much more informative.