16. A system according to claim 13 , wherein the similarity is determined by forming a score vector for each uncoded document and each coded reference document and calculating a similarity metric between the score vectors for the uncoded documents and coded reference documents as an inner product.
16. A system according to claim 13 , wherein the similarity is determined by forming a score vector for each uncoded document and each coded reference document and calculating a similarity metric between the score vectors for the uncoded documents and coded reference documents as an inner product. 17. A system according to claim 16 , wherein the inner product is determined according to the following equation: cos ⁢ ⁢ σ AB = 〈 S → A · S → B 〉  S → A  ⁢  S → B  where cos σ AB comprises a similarity between uncoded document A and coded reference document B, {right arrow over (S)} A comprises a score vector for the uncoded document A, and {right arrow over (S)} B comprises a score vector for the coded reference document B.