4. The method of claim 1 , wherein constructing, by the computer, the document sentiment vector space from the group of document further comprises: creating a term-by-document matrix of all terms occurring in the group of documents; and decomposing the term-by-document matrix into a term-by-concepts matrix and a documents-by-concepts matrix.
4. The method of claim 1 , wherein constructing, by the computer, the document sentiment vector space from the group of document further comprises: creating a term-by-document matrix of all terms occurring in the group of documents; and decomposing the term-by-document matrix into a term-by-concepts matrix and a documents-by-concepts matrix. 7. The method of claim 4 , wherein defining the region of sentimental significance in the document sentiment vector space further comprises: creating an action document vector for each document vector from the documents-by-concepts matrix representing a sentimentally significant document.