Aletta Grisay|Christian Monseur
MEASURING THE EQUIVALENCE OF ITEM DIFFICULTY IN THE VARIOUS VERSIONS OF AN INTERNATIONAL TEST
University of Liège|University of Liège
article data reading literacy study conducted 2000 2001 part oecd programme international student assessment pisa analysed order explore equivalence issues across 47 test adaptations various languages instruction used participating countries average 82 variance relative item difficulty found common across various national versions however index equivalence appeared lower desirable certain categories countries tentative analyses conducted better understand reasons behind differences