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Vocabulary growth (TTR-dynamics)

The growth of the vocabulary of a text is measured with the sequence of the TTR values. TTR is an acronym for type-token-ratio. This is the relation between the number of different character strings (types) and the total number of character strings (tokens) in a text. The TTR-value is dependent on the length of a text, and so a comparison of different values makes only sense after a defined number of words.

The TTR always starts with 1.0 and moves towards 0, but it will never reach it. TextQuest computes the TTR-values in defined distances (100, 200, 300, 400, ..., 1000, 2000 etc words). So the values of texts of different lengths can be compared.