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The match rating approach (MRA) is a phonetic algorithm developed by Western Airlines in 1977 for the indexation and comparison of homophonous names. The algorithm itself has a simple set of encoding rules but a more lengthy set of comparison rules. The main mechanism being the similarity comparison which calculates the number of unmatched characters by comparing the strings from left to right and then from right to left and removing identical characters. This value is subtracted from 6 and then compared to a minimum threshold. The minimum threshold is defined by table A and is dependent upon the length of the strings. The encoded name is known (perhaps incorrectly) as a personal numeric identifier (PNI). The PNI codex can never contain more than 6 alpha only characters. Match rating approach performs well with names containing the letter "y" unlike the original flavour of the NYSIIS algorithm. For example, the surnames "Smith" and "Smyth" are successfully matched. MRA does not perform well with encoded names that differ in length by more than 2. ==Encoding rules== # Delete all vowels unless the vowel begins the word # Remove the second consonant of any double consonants present # Reduce codex to 6 letters by joining the first 3 and last 3 letters only 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Match rating approach」の詳細全文を読む スポンサード リンク
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