4. The system of claim 3 , wherein elements of the term document matrix have values based on a number of computer program calls in a computer application corresponding to the column and in the category corresponding to the row, at least one of the computer program calls corresponding to one of the categories.
4. The system of claim 3 , wherein elements of the term document matrix have values based on a number of computer program calls in a computer application corresponding to the column and in the category corresponding to the row, at least one of the computer program calls corresponding to one of the categories. 5. The system of claim 4 , wherein the elements of the term document matrix have values weighted by the number of computer program calls in the computer application corresponding to the column, and a number of computer applications in the plurality of computer applications that contain computer program calls in the category corresponding to the row.