Orlando and Thissen (2000) developed an item fit statistic for binary item response theory (IRT) models known as S-X[superscript 2]. This article generalizes their statistic to polytomous unfolding models. Four alternative formulations of S-X[superscript 2] are developed for the generalized graded unfolding model (GGUM). The GGUM is a…

The study evaluated the usefulness of acoustic tracking as a supplement to perceptual judgments during remediation of articulation errors with a 10-year-old. Analysis of temporal and spectral characteristics of recorded imitations of sentence stimuli were compared with perceptual judgments of articulatory change over a 70-day remediation period…

This study introduced a probabilistic model utilizing item response theory (IRT) for dealing with a variety of misconceptions. The model can be used for evaluating the transition behavior of error types, advancement of learning stages, or the stability and persistence of particular misconceptions. Moreover, it apparently can be used for relating…

This study examined the criterion-related validity of oral reading fluency (ORF), number of words read correctly per minute, with 64 regular, remedial, and special education elementary-level students. Comparison with two miscue-based assessment measures did not support modification of traditional ORF but did suggest practical value of selected…