corpus-introduction--section-1--语料库.ppt

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1、CL timetable 27/03 (Wed) 18:30-21:30E6-224 28/03 (Thu) 13:15-16:40E6-219 29/03 (Fri)14:05-17:30E6-219 03/04 (Wed) 18:30-21:30E6-224 07/04 (Fri)14:05-17:30E6-219 10/04 (Wed) 18:30-21:30E6-224 11/04 (Thu)13:15-16:40E6-219 12/04 (Fri)14:05-17:30E6-219Introducing Corpus LinguisticsCorpus LinguisticsRich

2、ard XModule description Since the 1990s, the corpus methodology has revolutionized nearly all branches of linguistics Corpus analysis can be illuminating in “virtually all branches of linguistics or language learning.” (Leech 1997) One of the strengths of corpus data lies in its empirical and attest

3、ed nature pools together the intuitions of a great number of speakers makes linguistic analysis more objective This module introduces the theoretical and practical issues of using corpora in linguistic studies explores how the corpus-based approach and other methodologies can be combined in linguist

4、ic studiesAims of the module The module aims to provide an introduction to corpus linguistics; familiarise students with major corpus resources and tools; pass on essential knowledge and skills for building DIY corpora; to keep students up to date with the latest developments in corpus research; dev

5、elop students ability in corpus-based language studies.Contents1)Introducing corpus linguistics2)Corpus design and types of corpora3)Data capture and markup4)Corpus annotation5)Making statistic claims6)Corpus analysis (1): concordance and wordlist7)Corpus analysis (2): keyword analysis8)Corpora in l

6、exicographic and lexical studies9)Corpora in grammatical studies10) Corpora in diachronic studies11)Corpora in language variation research12)Corpora in sociolinguistic studies13)Corpora in language education14)Corpora in literary and stylistic studies15)Corpora in critical discourse analysis16)Corpo

7、ra in contrastive and translation studiesLearning outcomesOn successful completion of the module, students will be able tounderstand the major theoretical frameworks in corpus linguistics and formulate research questions that are amenable to corpus research;think critically about the strengths and w

8、eaknesses of the corpus methodology and decide when and how to interface it with other methodologies;get familiar with major corpus resources and tools and to develop DIY corpora when necessary;apply the corpus-based approach in their own research.Teaching/learning strategies With a dual focus on wh

9、y and how to in corpus-based language studies, this practical module will be delivered through a series of lectures and hands-on lab sessions The module also engages students in extensive reading and interaction with corpus data outside of classAssessment Option A A 1,000-word essay that critically

10、reviews a corpus exploration tool or a corpus-based study (40%) A 2,500-word project report (60%) Option B One 3,500-word essay based on a research project of your own choice (100%) Deadline: Friday 31 May 2013 Submission A Word copy as email attachment Reading list Set text McEnery, A., Xiao, R. an

11、d Tono, Y. (2006) Corpus-Based Language Studies: An Advanced Resource Book. London & New York: Routledge. Wynne, M. (2005) Developing Linguistic Corpora. Oxford: Oxbow Books. Available online at http:/www.ahds.ac.uk/creating/guides/linguistic-corpora Recommended reading See the module syllabus at th

12、e course website www.lancs.ac.uk/fass/projects/corpus/ZJU/CL_syllabus.htm(pass for unzipping ebooks: lancs)Outline of this session Lecture: introducing key concepts and debates in corpus linguistics What is and is not a corpus? Why use corpora? Corpora vs. intuitions The corpus methodology A brief h

13、istory of Corpus Linguistics Nature and applications of corpus-based studies Lab: testing your intuitions + exploring online resourcesWhat is a corpus? The word corpus comes from Latin (“body”) and the plural is corpora A corpus is a body of naturally occurring language but rarely a random collectio

14、n of text Corpora “are generally assembled with particular purposes in mind, and are often assembled to be (informally speaking) representative of some language or text type.” (Leech 1992) “A corpus is a collection of (1) machine-readable (2) authentic texts (including transcripts of spoken data) wh

15、ich is (3) sampled to be (4) representative of a particular language or language variety.” (MXT 2006: 5)What is not a corpus?A list of words is not a corpus Building blocks of languageA text archive is not a corpus A random collection of textsA collection of citations is not a corpus A short quotati

16、on which contains a word or phrase that is the reason for its selectionA collection of quotations is not a corpus A short selection from a text chosen on internal criteria by human beingsA text is not a corpus Intending to be read in different waysThe Web is not a corpus Its dimensions unknown, cons

17、tantly changing, not designed from a linguistic perspectiveSinclair (2005)What is a corpus for? A corpus is made for the study of language in a broad sense To test existing linguistic theory and hypotheses To generate and verify new linguistic hypotheses Beyond linguistics, to provide textual eviden

18、ce in text-based humanities and social sciences subjects The purpose is reflected in a well-designed corpusWhy use corpora? Even expert speakers have only a partial knowledge of a language A corpus can be more comprehensive and balanced Even expert speakers tend to notice the unusual and think of wh

19、at is possible A corpus can show us what is common and typical Even expert speakers cannot quantify their knowledge of language A corpus can readily give us accurate statisticsWhy use corpora? Even expert speakers cannot remember everything they know A corpus can store and recall all the information

20、 that has been stored in it Even experts speakers cannot make up natural examples A corpus can provide us with a vast number of examples in real communication context Even expert speakers have prejudices and preferences and every language has cultural connotations and underlying ideology A corpus ca

21、n give you more objective evidenceWhy use corpora? Even expert speakers are not always available to be consulted A corpus can be made permanently accessible to all Even expert speakers cannot keep up with language change A constantly updated corpus can reflect even recent changes in the language Eve

22、n expert speakers lack authority: they can be challenged by other expert speakers A corpus can encompass the actual language use of many expert speakersIntuitions as an alternative Intuitions are always useful in linguistics To invent (grammatical, ungrammatical, or questionable) example sentences f

23、or linguistic analysis To make judgments about the acceptability / grammaticality or meaning of an expression To help with categorizationIntuitions as an alternative Intuitions should be applied with caution Possibly biased as they are likely to be influenced by ones dialect or sociolect Introspecti

24、ve data is artificial and may not represent typical language use as one is consciously monitoring ones language production Introspective data is decontextualized because it exists in the analysts mind rather than in any real linguistic context Intuitions are not observable and verifiable by everyone

25、 as corpora are Excessive reliance on intuitions blinds the analyst to the realities of language usage because we tend to notice the unusual but overlook the commonplace There are areas in linguistics where intuitions cannot be used reliably e.g. language variation, historical linguistics, register

26、and style, first and second language acquisition Human beings have only the vaguest notion of the frequency of a construct or a wordBenefits of corpus data Corpus data is more reliable A corpus pools together linguistic intuitions of a range of language speakers, which offsets the potential biases i

27、n intuitions of individual speakers Corpus data is more natural It is used in real communications instead of being invented specifically for linguistic analysis Corpus data is contextualized Attested language use which has already occurred in real linguistic context Corpus data is quantitative Corpo

28、ra can provide frequencies and statistics readily Corpus data can find differences that intuitions alone cannot perceive E.g. synonyms totally, absolutely, utterly, completely, entirelyCorpora vs. intuitions Not necessarily antagonistic, but rather corroborate each other and can be gainfully viewed

29、as being complementary Armchair linguists and corpus linguists “need each other. Or better, the two kinds of linguists, wherever possible, should exist in the same body.” (Fillmore 1992) “Neither the corpus linguist of the 1950s, who rejected intuitions, nor the general linguist of the 1960s, who re

30、jected corpus data, was able to achieve the interaction of data coverage and the insight that characterize the many successful corpus analyses of recent years.” (Leech 1991) The key to using corpus data is to find the balance between the use of corpus data and the use of ones intuitionsThe corpus me

31、thodology It is debatable whether CL is a methodology or a branch of linguistics CL goes well beyond this methodological role and has become an independent discipline In spite of the name, CL is indeed a methodology rather than an independent branch of linguistics in the same sense as phonetics, syn

32、tax, semantics or pragmatics These latter areas of linguistics describe, or explain, a certain aspect of language use Corpus linguistics, in contrast, is not restricted to a particular aspect of language - it can be employed to explore almost any area of linguistic researchA brief history of CL The

33、term corpus linguistics first appeared only in the early 1980s, but corpus-based language study has a substantial history The history of CL can be split into two periods: before and after ChomskyA brief history of CL Before Chomsky Field linguists and linguists of the structuralist tradition used “s

34、hoebox corpora” shoeboxes filled with paper slips Their methodology was essentially “corpus-based” in the sense that it was empirical and based on observed data The work of early corpus linguistics was underpinned by two fundamental, yet flawed assumptions The sentences of a natural language are fin

35、ite. The sentences of a natural language can be collected and enumerated. Most linguists saw the “corpus” as the only source of linguistic evidence in the formation of linguistic theoriesA brief history of CLChomsky revolution: Between 1957 and 1965 Chomsky changed the direction of linguistics from

36、empiricism towards rationalism “Any natural corpus will be skewed. Some sentences wont occur because they are obvious, others because they are false, still others because they are impolite. The corpus, if natural, will be so wildly skewed that the description would be no more than a mere list.” (Cho

37、msky 1962) Our internal knowledge of language in human brain (competence, I-language) replaces observed data (performance, E-language) Intuitions started to be relied on as evidenceXiao, R. (2008) “Theory-driven corpus research: using corpora to inform aspect theory”. In A. Ldeling & M. Kyto (eds.)

38、Corpus Linguistics: An International Handbook. Berlin: Mouton de GruyterA brief history of CL Revival of CL Corpus research was continued in a few centres (Brown, Lancaster) in the 60s-70s The Brown University Standard Corpus of Present-day American English (Brown corpus) Lancaster-Oslo-Bergen Corpu

39、s of BrE (LOB) The hardware still imposed some restrictions until the real development started in the 1980s The marriage of corpora with computer technology rekindled interest in the corpus methodology Since then, the number and size of corpora and corpus-based studies have increased dramatically No

40、wadays, the corpus methodology enjoys widespread popularity, and has opened up or foregrounded many new areas of researchAreas that have used corpora Lexicography Lexical studies Grammatical studies Register/genre analysis Language variation Contrastive analysis Translation studies Language change L

41、anguage teaching Semantics Pragmatics Stylistics Literary study Sociolinguistics Discourse analysis Forensic linguistics Computational linguistics Nature of corpus-based approach It is empirical, analysing the actual patterns of use from natural texts It utilises a large and principled collection of

42、 natural texts as the basis for analysis It makes extensive use of computers for analysis, using both automatic and interactive techniques It integrates both quantitative and qualitative analytical techniques(Biber et al 1998: 4-5)Why use computers? Development of computer technology has revived CL

43、Machine-readability is a de facto attribute of modern corpora Electronic corpora have advantages unavailable to their “shoebox” ancestors It is the use of computerized corpora, together with computer programs which facilitate linguistic analysis, that distinguishes modern electronic corpora from ear

44、ly drawer-cum-slip corporaWhy use computers? Computerized corpora can be processed and manipulated rapidly at minimal cost E.g. searching, selecting, sorting and formatting Computers can process machine-readable data accurately and consistently Computers can avoid human bias in an analysis, thus mak

45、ing the result more reliable Machine-readability allows further automatic processing to be performed on the corpus so that corpus texts can be enriched with various metadata and linguistic analyses Corpus markup and corpus annotationA question for Deep Thought“Alright,” said the computer Deep Though

46、t. “The Answer to the Great Question.” “Yes.!”“Of Life, the Universe and Everything .” said Deep Thought. “Yes.!”“Is.”“Yes.!.?” “Forty-two,” said Deep Thought, with infinite majesty and calm.It was a long time before anyone spoke. “Forty-two!” yelled someone in the audience. “Is that all youve got t

47、o show for seven and a half million years work?”“I checked it very thoroughly,” said the computer, “and that quite definitely is the answer. I think the problem, to be quite honest with you, is that youve never actually known what the question is.” Hitchhikers Guide to the Galaxy by Douglas AdamsWha

48、t can we learn from this story?What corpora cannot do Corpora do not provide negative evidence Cannot tell us what is possible or not possible Can show what is central and typical in language Corpora can yield findings but rarely provide explanations for what is observed Interfacing other methodolog

49、ies The use of corpora as a methodology also defines the boundaries of any given study Importance of amenable research questions The findings based on a particular corpus only tell us what is true in that corpus Generalisation vs. representativeness See Unit B2 for pros and cons of corporaAsk corpor

50、a the right questions Corpus linguistics as a methodology is only one of the (many) ways of doing things “doing linguistics” The usefulness of corpora depends upon the research question being investigated “They are invaluable for doing what they do, and what they do not do must be done in another wa