手法を比較

	Krippendorff's Alpha	コンテンツ分析
分野	Communication	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1970	Systematised through Krippendorff's methodology work; 4th edition 2018
提唱者	Klaus Krippendorff	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research
種類	Chance-corrected reliability coefficient for coded data	Qualitative / mixed-method research technique
原典	Hayes, A. F., & Krippendorff, K. (2007). Answering the call for a standard reliability measure for coding data. Communication Methods and Measures, 1(1), 77–89.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661
別名	Krippendorff alpha, K-alpha, Alpha reliability coefficient, Krippendorff Alfa Katsayısı	İçerik Analizi, systematic content coding, quantitative content analysis
関連	4	5
概要	Krippendorff's alpha is a chance-corrected coefficient that quantifies the reliability of coding decisions made by two or more observers, and is the standard reliability statistic in communication content analysis. Unlike percent agreement, it corrects for the agreement expected by chance; unlike Cohen's kappa, it generalizes seamlessly to any number of coders, any measurement level (nominal, ordinal, interval, ratio), and data sets with missing values.	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.