If the discrimination parameters differ across groups in a differential item functioning (DIF) study, which of the following types of DIF would be exhibited?

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Nonuniform DIF occurs when the discrimination parameters (i.e., how well an item differentiates between individuals of differing ability levels) vary across groups, leading to differences in how item scores relate to the underlying trait being measured across these groups. Uniform DIF, in contrast, would involve consistent differences in difficulty across groups without interaction between ability level and group membership. Single-group and multi-group are not standard types of DIF related to discrimination parameters.

If the Discrimination Parameters Differ Across Groups in a Differential