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Examining Item Parameter Drift as a Source of Construct Shift
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Item parameter drift (IPD) is defined as differential change in item parameters or ability estimates over time or testing occasions. Unlike previous IPD studies that have focused on change in item parameters over time, this study examined IPD to detect change in item parameters (construct shift) between grade levels within a single time point. Data for this study come from the Minnesota Student Survey (MSS). Hierarchical general linear modeling (HGLM) framework was used for examining IPD in the items of “being bullied” and “school climate” scales from the MSS. Results indicated that almost all of the items drift across grade levels (6th, 9th, and 12th). This suggests that being bullied and school climate constructs are not invariant across grade levels.
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- Date created
- 2013-04-01
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- Conference/Workshop Presentation