* Accepted for Proc. ACM Interact. Mob. Wearable Ubiquitous Technol.,
Vol. 4, No. 1. Will be updated with final version once available Access Paper or Ask Questions
* 11 pages, in French, 5 figures. Workshop Evaluation des m\'ethodes
d'Extraction de Connaissances dans les Donn\'ees EvalECD EGC'10, 2010 Tunis Access Paper or Ask Questions