Differential item functioning is present when something about the characteristics of a test taker interferes with the relationship between ability and item response. Nonuniform differential item functioning exists when there is interaction between ability level and group membership. The aim of this study is to propose guidelines to evaluate the severity of NUDIF, taking into account the family of Rasch models. The severity of NUDIF is evaluated trying to quantify the overall biasing impact of the presence in the test of NUDIF items, on the estimated measure of the latent trait of interest.
A proposal for categorizing the severity of nonuniform differential item functioning: the polytomous case
GOLIA, Silvia
2016-01-01
Abstract
Differential item functioning is present when something about the characteristics of a test taker interferes with the relationship between ability and item response. Nonuniform differential item functioning exists when there is interaction between ability level and group membership. The aim of this study is to propose guidelines to evaluate the severity of NUDIF, taking into account the family of Rasch models. The severity of NUDIF is evaluated trying to quantify the overall biasing impact of the presence in the test of NUDIF items, on the estimated measure of the latent trait of interest.File in questo prodotto:
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