MATTR

[Brian MacWhinney]

Dear ChiBolts,
   I forgot that Leonid had already implement the MATTR (moving average TTR) measure inside FREQ.  Here is what it says in the manual in section 9.9.3.

+bN This option calculates the lexical diversity of a sample using the Moving Average Type-Token Ratio (MATTR). This index is based on a moving window that computes TTRs for each successive window of fixed length (N). Initially, a window length is selected (e.g., 10 words) and the TTR for words 1- 10 is estimated. Then, the TTR is estimated for words 2-11, then 3-12, and so on to the end of the text. For the final score, the estimated TTRs are averaged.

The references is:

Covington, M. A., & McFall, J. D. (2010). Cutting the Gordian knot: The moving-average type–token ratio (MATTR). Journal of Quantitative Linguistics, 17(2), 94-100. 


—Brian MacWhinney

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