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:''A trigram may also refer to Ba gua, a philosophical concept in ancient China. It may also refer to a three-letter acronym. Trigrams are a special case of the ''n''-gram, where ''n'' is 3. They are often used in natural language processing for doing statistical analysis of texts. ==Frequency== A typical cryptanalytic frequency analysis finds that the 16 most common character-level trigrams in English are:〔 Table also available from (pages.central.edu )〕 Because encrypted messages sent by telegraph often omit punctuation and spaces, cryptographic frequency analysis of such messages includes trigrams that straddle word boundaries. This causes trigrams such as "edt" to occur frequently, even though it may never occur in any one word of those messages. 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「Trigram」の詳細全文を読む スポンサード リンク
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