15. A method according to claim 10 , further comprising: comparing one of the uncoded documents in one of the clusters to the reference documents and generating a neighborhood comprising a predetermined number of the reference documents that are most similar to the uncoded document based on the comparison of the uncoded document to the reference documents; and suggesting one of the classification codes for assignment to the uncoded document based on the classification codes of the reference concepts in the neighborhood.
15. A method according to claim 10 , further comprising: comparing one of the uncoded documents in one of the clusters to the reference documents and generating a neighborhood comprising a predetermined number of the reference documents that are most similar to the uncoded document based on the comparison of the uncoded document to the reference documents; and suggesting one of the classification codes for assignment to the uncoded document based on the classification codes of the reference concepts in the neighborhood. 16. A method according to claim 15 , wherein the predetermined number comprises a sum of predetermined numbers of reference documents for each of the classification codes.