The product-process ratio

A 2024 study built on this same family of measures. It trained a classifier on keystroke logs from two groups, one composing an essay from scratch, one transcribing an existing one, and distinguished them at 99% accuracy.33 Crossley, S., Tian, Y., Choi, J. S., Holmes, L., & Morris, W. (2024). Plagiarism Detection Using Keystroke Logs. Proceedings of the 17th International Conference on Educational Data Mining, 476–483.

Colophon uses the same underlying event data, edit blocks, positions, timestamps, as a voluntary disclosure standard rather than a research-capture tool. The methodology is the same. The purpose is different.