R script now calculates the measures proposed in MacKenzie, I. S., Kauppinen, T., & Silfverberg, M. (2001). Accuracy measures for evaluating computer pointing devices. In Proceedings of the SIGCHI conference on Human factors in computing systems - CHI ’01 (pp. 9–16). New York, New York, USA: ACM Press. doi:10.1145/365024.365028