手法を比較

	Sentiment Analysis in Communication	コンテンツ分析
分野	Communication	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	2010	Systematised through Krippendorff's methodology work; 4th edition 2018
提唱者	Adapted into communication research from NLP / opinion mining	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research
種類	Automated classification of message valence/tone	Qualitative / mixed-method research technique
原典	Tausczik, Y. R., & Pennebaker, J. W. (2010). The psychological meaning of words: LIWC and computerized text analysis methods. Journal of Language and Social Psychology, 29(1), 24–54.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661
別名	Opinion mining in communication, Tone analysis, Media sentiment analysis, İletişimde Duygu Analizi	İçerik Analizi, systematic content coding, quantitative content analysis
関連	5	5
概要	Sentiment analysis is the automated estimation of the valence — positive, negative, or neutral tone — of communication messages, adapted from natural-language processing into a core measurement technique for media and communication research. It lets scholars quantify the tone of news coverage, the affect of social-media discourse, or audience reactions across corpora far too large for hand coding, while treating tone as a measurable, validatable construct.	Content analysis is a systematic research technique for reducing text, visual, or media material into coded categories so that patterns can be counted, compared, and interpreted. Formalised by Klaus Krippendorff in his widely cited methodology textbook (latest edition 2018), the method sits at the boundary of qualitative and quantitative inquiry: it imposes structured, replicable coding on inherently meaning-laden material.