手法を比較

	Holsti's Method	Krippendorff's Alpha
分野	Communication	Communication
系統	Process / pipeline	Process / pipeline
提唱年	1969	1970
提唱者	Ole R. Holsti (after Osgood)	Klaus Krippendorff
種類	Percent-agreement reliability index for coded content	Chance-corrected reliability coefficient for coded data
原典	Holsti, O. R. (1969). Content Analysis for the Social Sciences and Humanities. Reading, MA: Addison-Wesley. ISBN: 9780201029406	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.
別名	Holsti reliability, Holsti's coefficient of reliability, Holsti C.R., Holsti Güvenirlik Katsayısı	Krippendorff alpha, K-alpha, Alpha reliability coefficient, Krippendorff Alfa Katsayısı
関連	4	4
概要	Holsti's method is a percent-agreement reliability index for content analysis, popularized by Ole Holsti's 1969 textbook and derived from Osgood's earlier formula. For two coders it is twice the number of coding decisions on which they agree divided by the total number of decisions each made — a simple, intuitive measure of how often coders reach the same judgment.	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.