We present a logistic function of a monotonic polynomial with a lower asymptote, allowing additional flexibility beyond the three-parameter logistic model. We develop a maximum marginal likelihood based approach to estimate the item parameters. The new item response model is demonstrated on math assessment data from a state, and a computationally…

Current educational policy highlights the important role that assessment can play in improving education. State standards and the assessments that are aligned with them establish targets for learning and promote school accountability for helping all students succeed; at the same time, feedback from assessment results is expected to provide …

When a state test and National Assessment of Educational Progress (NAEP) are both measuring the same construct, the achievement gaps between subgroups on both tests should be the same. However, if a teacher or school engages in "teaching to the test" then student performance may improve on one test but not on another. We hypothesized that…