MATTR – Alex Reuneker

§238. MATTR added to the Lexical Diversity Calculator (4 juni 2025)

In Taal by Alex – #calculator #Lexical Diversity #MATTR #tokens #ttr #types

Last week, I implemented the calculation of MATTR (Moving Average TTR) into the Lexical Diversity Calculator. MATTR calculates the mean TTR for successive windows of a text (Covington & McFall, 2010), getting, at least that is the idea, a more stable indication of lexical diversity. While that’s not entirely the case (see Bestgen, 2025), you can still test it at https://www.reuneker.nl/ld.

Photo by Sean Nufer on Unsplash

Next: implementing a compression-rate measure to operationalize text repetiveness for what hopefully becomes a project together with Vivien Waszink!

§235. Improvements to the Lexical Diversity Calculator (29 mei 2025)

In Taal by Alex – #calculator #Lexical Diversity #MATTR

In the last couple of days, I’ve been implementing various improvements to the Lexical Diversity Calculator. Not only did I fix a problem in the calculation of MTLD, which resulted in numbers that were slightly off, but I’ve also streamlined the calculations and added the calculation of Moving average TTR (MATTR).

Photo by Siora Photography on Unsplash.

Updates

2025-05-29: Added choice to use natural logarithm or base 10 in

calculation Maas’s a2, Dugast’s U2, and Herdan’s C.

2025-05-29: Various improvements to calculations and algorithms; added MATTR.
2025-05-26: Important change to the calculation of MTLD, which was slightly off before due to not averaging the forward and backward algorithm.

Next to this, I’m also working on an R-package to easily calculate several measures of lexical diversity, primarily for a research project I’m envisioning for the near future. Stay tuned! For now, please see the online calculator at https://www.reuneker.nl/ld for the newest version.