... two approaches using unlabeled data in text categorization; one approach combines unlabeled data and labeled data, and the other approach uses the clustering technique for text categorization ... to Classify Text from Labeled and Unlabeled Documents, In Proc of AAAI-98 K P Nigam, 2001, Using Unlabeled Data to Improve Text Classification, The dissertation for the degree of Doctor of Philosophy ... conclusions and future works Related Works In general, related approaches for using unlabeled data in text categorization have two directions; One builds classifiers from a combination of labeled and unlabeled...