TY - CHAP
T1 - Rasch models
AU - Andrich, D.
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The Rasch models arise from the a priori requirements that, from the responses of a class of persons to a class of items, the comparison between locations of persons should be independent of the relative locations of items, and vice versa. Arising from these requirements, a general model for responses in ordered categories, of which responses in two ordered categories are a special case, follows. Deviations of empirical responses from the model are then taken to violate these requirements of invariance. Ideally, these violations are corrected empirically rather than by using a more complicated model to account for the data.
AB - The Rasch models arise from the a priori requirements that, from the responses of a class of persons to a class of items, the comparison between locations of persons should be independent of the relative locations of items, and vice versa. Arising from these requirements, a general model for responses in ordered categories, of which responses in two ordered categories are a special case, follows. Deviations of empirical responses from the model are then taken to violate these requirements of invariance. Ideally, these violations are corrected empirically rather than by using a more complicated model to account for the data.
KW - Differential item functioning
KW - Fundamental measurement
KW - Invariance
KW - Ordered categories
KW - Polytomous responses
UR - http://www.scopus.com/inward/record.url?scp=84884433220&partnerID=8YFLogxK
U2 - 10.1016/B978-0-08-044894-7.00258-X
DO - 10.1016/B978-0-08-044894-7.00258-X
M3 - Chapter
AN - SCOPUS:84884433220
SN - 9780080448947
SP - 111
EP - 122
BT - International Encyclopedia of Education
PB - Pergamon
ER -