Roel Popping taught statistics and methodology courses including text analysis at the Department of Sociology at the University of Groningen, the Netherlands, until his retirement. His research interests included methodology, with a specialty in the study of agreement and in text analysis, its application in research on historical shifts in public opinion and values, primarily within the context of post-1989 Central and Eastern Europe, in decision-making of negotiation processes and in integrating scientific knowledge.

• Text AnalysisWhat and Why?Further Conceptual FoundationsRecent Approaches to Quantitative Text AnalysisThematic Text AnalysisSemantic Text AnalysisNetwork Text AnalysisSampling, Reliability and ValidityRelation to Qualitative ResearchRelation to Linguistics and Information Retrieval