Best Selling Books by Charles Murray

"Sea Scouts up-Channel" by Percy F. Westerman delivers classic nautical adventure perfect for readers of all ages. This thrilling juvenile fiction tale follows the exploits of sea scouts as they navigate the challenges and excitement of life on the water. A captivating boys'' adventure story, meticulously prepared for print republication, it embodies the spirit of camaraderie and courage. Dive into this timeless story of action, adventure, and nautical skill. A must-read for fans of classic juvenile fiction. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

In Cognitive Tutors, student skill is represented by estimates of student knowledge on various knowledge components. The estimate for each knowledge component is based on a four-parameter model developed by Corbett and Anderson [Nb]. In this paper, we investigate the nature of the parameter space defined by these four parameters by modeling data from over 8000 students in four Cognitive Tutor courses. We conclude that we can drastically reduce the parameter space used to model students without compromising the behavior of the system. Reduction of the parameter space provides great efficiency gains and also assists us in interpreting specific learning and performance parameters. (Contains 4 figures.) [For the complete proceedings, "Proceedings of the International Conference on Educational Data Mining (EDM) (2nd, Cordoba, Spain, July 1-3, 2009)," see ED539041.].