Philip Pavlik, Hao Cen, Lili Wu, Kenneth R. Koedinger. Using Item-type Performance Covariance to Improve the Skill Model of an Existing Tutor. In Ryan Shaun Joazeiro de Baker, Tiffany Barnes, Joseph E. Beck, editors, Educational Data Mining 2008, The 1st International Conference on Educational Data Mining, Montreal, Québec, Canada, June 20-21, 2008. Proceedings. pages 77-86, www.educationaldatamining.org, 2008. [doi]
Abstract is missing.