浙江大学肖忠华语料库session 7.ppt

Keyword list to download! Keyword cloud – even more interesting! New Labour’s key concepts(“Key concepts compared to”) LG3204 Corpus Linguistics 07-08 Corpus analysis (2) Corpus Linguistics Richard Xiao lancsxiaoz@ Outline of the session Lecture Keyword Reference corpus Key keyword Lab WST keyword AntConc keyword Wmatrix keyword / key concept What is keyword? Keywords are those words whose frequency is exceptionally high (positive keywords) or low (negative keywords) in comparison with a reference corpus Keywords usually refer to positive keywords But negative keywords are equally interesting (see Xiao and McEnery 2005) They appear at the very end of your listing, in a different colour in WordSmith They are omitted automatically from a keywords database and a keyword plot Why keyword analysis? Indicating the ‘aboutness’ (Scott 1999) of a particular text or corpus Contents analysis, discourse analysis Also revealing the salient features which are functionally related to a particular genre (Xiao and McEnery 2005) Genre analysis, stylistic analysis How to do keyword analysis Make a wordlist of the target corpus Locate or make a word list of a reference corpus Scott (2005) “In search of a bad reference corpus” /system/files/es1_05scott.pdf The reference corpus is usually larger than the target corpus The appropriateness of a reference corpus depends on your research questions! Compare the frequency of each item in the two wordlists to extract keywords – done automatically Analyse and interpret keywords – you will do it! Keywords in the Blair text Target corpus – just one text ‘Why Blair is so determined not to run into sands’ (The Times, 16th November 2005) http://www.timesonline.co.uk/tol/news/politics/article590683.ece Local copy available (Blair_text) Reference corpus The 100-million-word BNC Tool WST Keyword Wordlists of the Blair text and the BNC BNC list: /downloads/version4/BNC_World.zip Creating keyword list Keyword extraction in progress Warning: It can ta