[Association for Computational Linguistics the 2003 Conference of the North American Chapter of the Association for Computational Linguistics - Edmonton, Canada (2003.05.27-2003.06.01)] Proceedings of the 2003 Conference of the North American Chapter of the Association for Computational Linguistics on Human Language Technology companion volume of the Proceedings of HLT-NAACL 2003--short papers - NAACL '03 - Story link detection and new event detection are asymmetric