手法を比較

	Keyness Analysis	批判的談話分析
分野	言語学	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1997	Late 1970s–1990s (systematised ~1979–1995)
提唱者	Mike Scott	Norman Fairclough; Teun A. van Dijk; Ruth Wodak
種類	Corpus comparison of relative word frequencies	Qualitative research method
原典	Scott, M. (1997). PC analysis of key words — and key key words. System, 25(2), 233–245.	Fairclough, N. (1992). Discourse and Social Change. Polity Press.
別名	Keyword Analysis, Corpus Keyness, Keyness Statistics	CDA, Critical Linguistics, Discourse-Historical Approach, Dialectical-Relational Analysis
関連	3	6
概要	Keyness analysis identifies the words that are characteristically frequent (or infrequent) in a target corpus relative to a reference corpus, using statistical tests to measure how unexpected each word's frequency is. Introduced by Mike Scott in 1997, it answers the question 'what is this text or collection distinctively about?' and is a central technique in corpus linguistics and corpus-assisted discourse analysis for surfacing the salient vocabulary of a genre, period, author, or social group.	Critical Discourse Analysis (CDA) is a qualitative method that examines how language in texts and talk constructs, sustains, and challenges relations of power, ideology, and social inequality. Drawing on linguistics, social theory, and critical philosophy, CDA treats discourse not merely as communication but as social practice — a site where dominance is reproduced and where resistance can be articulated. Developed in the late twentieth century by Norman Fairclough, Teun van Dijk, and Ruth Wodak, among others, CDA is applied to political speeches, media texts, policy documents, educational materials, and institutional interactions.