7. The method of claim 1 , wherein the count weight is set to one and the word score weight is set to a base 2 logarithm of a ratio of a count of unique words in the second document to a count of unique words in the first document.
7. The method of claim 1 , wherein the count weight is set to one and the word score weight is set to a base 2 logarithm of a ratio of a count of unique words in the second document to a count of unique words in the first document. 8. The method of claim 7 , wherein the word score weight is set to the base 2 logarithm of the ratio of the count of unique words in the second document to the count of unique words in the first document when the word score weight is greater than one, and the word score weight is set to one when the base 2 logarithm of the ratio of the count of unique words in the second document to the count of unique words in the first document is less than or equal to one.