TY - CONF T1 - Assessor error in stratified evaluation T2 - Proceedings of the 19th ACM international conference on Information and knowledge management Y1 - 2010 A1 - Webber,W. A1 - Oard, Douglas A1 - Scholer,F. A1 - Hedin,B. JA - Proceedings of the 19th ACM international conference on Information and knowledge management ER -