The attempt by D.Edwards and C. B. Cummings to adjust state mean Scholastic Aptitude Test Scores for differential participation rates with a "fuzzy truncation model" satisfies three criteria the authors previously defined but falls short for two. Omission of sensitivity studies mars the otherwise exemplary study. (SLD)

SCORIGHT is a very general computer program for scoring tests. It models tests that are made up of dichotomously or polytomously rated items or any kind of combination of the two through the use of a generalized item response theory (IRT) formulation. The items can be presented independently or grouped into clumps of allied items (testlets) or in…

Four researchers at the Educational Testing Service describe what they consider some of the most vexing research problems they face. While these problems are not completely statistical, they all have major statistical components. Following the introduction (section 1), in section 2, "Problems with the Simultaneous Estimation of Many True…