High Quality Content by WIKIPEDIA articles! 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. An n-gram is a subsequence of n items from a given sequence. The items in question can be phonemes, syllables, letters, words or base pairs according to the application. An n-gram of size 1 is referred to as a "unigram"; size 2 is a "bigram" (or, less commonly, a "digram"); size 3 is a "trigram"; and size 4 or more is simply called an "n-gram". Some language models built from n-grams are "(n ? 1)-order Markov models". An n-gram model is a type of probabilistic model for predicting the next item in such a sequence. n-grams are used in various areas of statistical natural language processing and genetic sequence analysis.

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