9. A computer system for reducing dimensions of a document vector used to determine the similarity of a first document to a plurality of other documents in the computer system, the system comprising: means for receiving a document that is input to the computer for determining the similarity of the document to the plurality of other documents; means for preprocessing the document to generate a document vector; and means for reducing a number of dimensions in the document vector, wherein the dimensionality of a document vector d created by the previous process is m and is reduced to a predefined k with dimensions determined by the following equation: d ^ ⁢ : ⁢ ⁢ d ^ = d T ⁢ U k ⁢ ∑ k - 1 , wherein d is the original document vector, U k and Σ k are the matrices resulted from the truncated singular value decomposition (SVD) process and {circumflex over (d)} is the document vector with reduced dimensionality {circumflex over (d)} having k dimensions; means for comparing the document vector of reduced dimensions to at least one document vector for the plurality of documents to determine a similarity of the document to the plurality of other documents; and means for displaying a measure of similarity of the document to the other documents to a human observer.
9. A computer system for reducing dimensions of a document vector used to determine the similarity of a first document to a plurality of other documents in the computer system, the system comprising: means for receiving a document that is input to the computer for determining the similarity of the document to the plurality of other documents; means for preprocessing the document to generate a document vector; and means for reducing a number of dimensions in the document vector, wherein the dimensionality of a document vector d created by the previous process is m and is reduced to a predefined k with dimensions determined by the following equation: d ^ ⁢ : ⁢ ⁢ d ^ = d T ⁢ U k ⁢ ∑ k - 1 , wherein d is the original document vector, U k and Σ k are the matrices resulted from the truncated singular value decomposition (SVD) process and {circumflex over (d)} is the document vector with reduced dimensionality {circumflex over (d)} having k dimensions; means for comparing the document vector of reduced dimensions to at least one document vector for the plurality of documents to determine a similarity of the document to the plurality of other documents; and means for displaying a measure of similarity of the document to the other documents to a human observer. 10. The system of claim 9 , further comprising: means for preprocessing a plurality of initial documents; and means for computing a data model representing the plurality of initial documents; and wherein the document vector for the document is compared to at least document vector for the data model to determine the similarity of the document to the documents forming the data model.