BibSonomy publications for /user/hotho/measureSat Apr 25 10:19:53 CEST 200918th International World Wide Web ConferenceApril641--641Evaluating Similarity Measures for Emergent Semantics of Social Tagging20092009 measure myown semantics similarity social tagging taggingsurvey tagorapub Social bookmarking systems and their emergent information structures, known as folksonomies, are increasingly important data sources for Semantic Web applications. A key question for harvesting semantics from these systems is how to extend and adapt traditional notions of similarity to folksonomies, and which measures are best suited for applications such as navigation support, semantic search, and ontology learning. Here we build an evaluation framework to compare various general folksonomy-based similarity measures derived from established information-theoretic, statistical, and practical measures. Our framework deals generally and symmetrically with users, tags, and resources. For evaluation purposes we focus on similarity among tags and resources, considering different ways to aggregate annotations across users. After comparing how tag similarity measures predict user-created tag relations, we provide an external grounding by user-validated semantic proxies based on WordNet and the Open Directory. We also investigate the issue of scalability. We ?nd that mutual information with distributional micro-aggregation across users yields the highest accuracy, but is not scalable; per-user projection with collaborative aggregation provides the best scalable approach via incremental computations. The results are consistent across resource and tag similarity.Thu Dec 18 13:57:57 CET 2008Morristown, NJ, USAProceedings of the 37th annual meeting of the Association for Computational Linguistics on Computational Linguistics25--32Measures of distributional similarity1999measure similarity toread Thu Mar 16 12:36:16 CET 2006SIGIR33-40Evaluating evaluation measure stability.2000evaluation measure