4. The method of claim 1 wherein the vector representation of the current document in an LSA space is generated from at least one decomposition matrix of a singular value decomposition of a co-occurrence matrix, W, between M words in a vocabulary V and N documents in a text corpus T.
4. The method of claim 1 wherein the vector representation of the current document in an LSA space is generated from at least one decomposition matrix of a singular value decomposition of a co-occurrence matrix, W, between M words in a vocabulary V and N documents in a text corpus T. 6. The method of claim 4 wherein the first number of words is a number of temporally adjacent words.