Picardy Indexing

Quidi

Quidi is a non-indexing side project of Picardy Indexing. It is used to analyze linguistic transcripts encoded in CHAT format.

You can use Quidi to calculate:

  • MLU (mean length of utterance), MLT, MLU5
  • Word/morpheme frequencies
  • Brown’s morphemes counts
  • Lexical class percentages (nouns, verbs, etc.)
  • Maximum length of words/utterances
  • Comparisons between tokens on different CHAT tiers
  • Distribution of words, utterances, and turns of various lengths
  • Lexical diversity

You can also filter the input on tier-specific search terms.

Quidi is available for Windows™ and Linux. These should be considered alpha software since more testing may be carried out and features may be added and/or modified. Your feedback is welcomed (picardy.indexing@gmail.com)!

Terms and conditions

Quidi is free of charge and freely distributable. The source code will not be made available. Quidi is licensed under Creative Commons Attribution 4.0 International. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/ (I’m not a lawyer, but my interpretation of the license is that, basically, you don’t have to pay me anything to download and use the software, and I can’t be held liable if the software doesn’t work the way you expect. Furthermore, you can repackage the software into a product of your own but you need to give me credit.)

Downloads

Click below to download an installer for the appropriate platform. If you would like to try Quidi but use a Macintosh™ computer, please let me know; I may be able to create a compatible version.

Windows (MSI; 46MB; uploaded July 2, 2025)

Note for Windows users: For the time being, after installing you need to run Quidi in administrator mode. Right-click the Quidi desktop icon and click Run as administrator from the pop-up. If you don’t see this option, right-click while holding down the Shift key. Windows will ask you if you wish to permit the software to make changes to your PC. This is a standard Windows warning when running in administrator mode; the only files that Quidi changes silently are its own configuration and log files.

Linux (tar.gz; 71MB; uploaded July 2, 2025)

Note for Linux users: Quidi toolbar buttons use the Segoe MDL2 Assets font; Windows has this font installed by default, but for Linux you will need to install it before using the software. You can download this font from Microsoft here. Look here if you need instructions for installing fonts in Linux.