Publication: IEICE TRANSACTIONS on Information and Systems Publication Date: 2014/06/01 Vol. E97-DNo. 6pp. 1477-1487 Type of Manuscript: Special Section PAPER (Special Section on Advances in Modeling for Real-world Speech Information Processing and its Application) Category: Speech Recognition Keyword: variable selection, linear regression, MLLR, fMLLR, model space adaptation, feature space adaptation,