IRT Information Function of Polytomously Scored Items under the Graded Response Model
项目反应理论等级反应模型项目信息量

Computerized adaptive testing(CAT) is one of the ultimate areas in the field of item response theory(IRT).Many high stake tests,such as GRE and TOEFL,have their CAT versions. Item selection strategy is the core content of CAT.And item information function(IIF) always is the important index of item selection.Although item information of dichotomously scored items has been extensively studied,item information of polytomously scored items receives much less attention. However,due to the advantages inbred in Co...