23. The streaming text data comparator of claim 19 , wherein the relationship value is based at least in part on a magnitude of the projection.
19. A streaming text data comparator, comprising: a streaming text data vectorizer configured to compute a vector representation of a unit of streaming text data at a rate equivalent to the transmission rate of the data; a vector projector configured to transform the vector representation into a projection into a predetermined multidimensional term subspace representing an existing document collection, the multidimensional term subspace being based on a term basis matrix of a decomposed term-by-document matrix of the existing document collection; and a relationship calculator configured to calculate a relationship value indicative of a relationship between the vector representation and the predetermined multidimensional term subspace at a rate equivalent to the transmission rate of the data, wherein the relationship value is a residual vector that quantifies the difference between the vector representation of the streaming text data document and the subspace representing the original document collection, wherein the relationship calculator is configured to append the projection of the vector representation of the unit of streaming text data to the existing document collection without determining a new multidimensional term subspace and without adding additional terms not originally included in the term basis matrix, the existing document collection being represented by a quantity of vectors corresponding to an equivalent quantity of documents in the existing document collection, the appending being performed when it is determined that a relationship exists between the streaming text data and the predetermined multidimensional term subspace, wherein the relationship exists when the residual vector is less than a threshold; wherein the unit of streaming text data includes a document, and one or more processors, wherein said streaming text vectorizer, said vector projector, and said relationship calculator are operable using said one or more processors.