5. A system according to claim 4 , wherein the central processing unit further selects a median value and edge conditions for the total frequency occurrences of the terms and generates the subset of documents from those documents in the set that satisfy the edge conditions.
5. A system according to claim 4 , wherein the central processing unit further selects a median value and edge conditions for the total frequency occurrences of the terms and generates the subset of documents from those documents in the set that satisfy the edge conditions. 7. A system according to claim 5 , wherein the central processing unit further sets the edge conditions based on a size of the documents.