Item response theory (IRT) methods are generally used to create score scales for large-scale tests. Research has shown that IRT scales are stable across groups and over time. Most studies have focused on items that are dichotomously scored. Now Rasch and other IRT models are used to create scales for tests that include polytomously scored items.…

Using data from 10 states, Hyde, Lindberg, Linn, Ellis, and Williams (2008) found gender similarities in performance on standardized math tests. The present study attempted to replicate this finding with national data and to extend it by examining whether gender similarities in math performance are moderated by race, socioeconomic status, or math…

Achieve was asked by the Washington State Academic Achievement and Accountability Commission, Office of the Superintendent for Public Instruction, and the Partnership for Learning to conduct a study of the 10th grade Washington Assessment of Student Learning (WASL). The intent of the study was to compare the content, rigor and passing scores on…