手法を比較

	談話分析	Grounded Theory	感情分析
分野	質的研究	質的研究	テキストマイニング
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1989 (Fairclough); 1987 (Potter & Wetherell)	1967	—
提唱者	Norman Fairclough; Jonathan Potter and Margaret Wetherell	Barney Glaser and Anselm Strauss	—
種類	Method	Method	NLP text-classification task
原典	Fairclough, N. (1989). Language and power. Longman.	Glaser, B. G., & Strauss, A. L. (1967). The discovery of grounded theory: Strategies for qualitative research. Aldine.	Pang, B. & Lee, L. (2008). Opinion Mining and Sentiment Analysis. Foundations and Trends in Information Retrieval, 2(1-2), 1-135.
別名	DA, Critical Discourse Analysis, Discursive Analysis	GT, Grounded Theory Approach	opinion mining, polarity detection, duygu analizi
関連	2	3	3
概要	Discourse analysis is a qualitative research methodology that examines how language, communication, and power shape meaning, identity, and social reality. Developed across linguistics, sociology, and psychology (particularly by Norman Fairclough and Jonathan Potter), discourse analysis goes beyond content to analyze language use as a social practice that constitutes and reflects power relations, ideologies, and social structures.	Grounded Theory (GT) is a systematic qualitative research methodology in which theory emerges directly from data through iterative analysis, rather than being imposed before data collection. Developed by Barney Glaser and Anselm Strauss in 1967, GT prioritizes generating explanatory frameworks grounded in evidence.	Sentiment analysis, also called opinion mining, is a natural-language-processing task that detects the emotional tone of text — typically classifying it as positive, negative, or neutral. It turns unstructured opinion text into structured, quantifiable polarity signals using one of three families of approaches: sentiment lexicons, trained machine-learning classifiers, or pretrained transformer models.