We review the GIDNA and CDM packages in R for fitting cognitive diagnosis/diagnostic classification models. We first provide a summary of their core capabilities and then use both simulated and real data to compare their functionalities in practice. We found that the most relevant routines in the two packages appear to be more similar than…

English language learners with disabilities (ELLWD) face many challenges in their academic career. Learning a new language and coping with their disabilities create obstacles in their academic progress. Variables relegating accessibility of assessments for students with disabilities and ELL students may seriously hinder the academic performance of…

Tested diagnostic classifications of child psychopathology produced by a computerized technique known as multidimensional actuarial classification (MAC), against the criterion of expert psychological opinion. Experts' agreement with MAC was significant for all classification areas, as was MAC's agreement with the experts held as a conjoint…

This paper compared clinicians' diagnosis and DSM-III (Diagnostic and Statistical Manual), DSM-III-R (Revised), and ICD-10 (International Classification of Diseases) diagnoses of 52 individuals with autism and 62 nonautistic, developmentally disordered individuals. The DSM-III-R system overdiagnosed the presence of autism, and ICD-10 closely…

Normally achieving, learning-disabled and mildly retarded students (n=148, ages 6-9) were trained to select the odd picture of a 3-picture array. Mildly retarded subjects showed large, consistent performance differences from the other groups, but learning-disabled subjects could not effectively be distinguished from normally achieving peers.…

A diagnostic methodology for large-scale assessment was employed to compare performance on a national test in mathematics of representative samples of Jewish and Arab 8th graders in Israel in order to shed light on a previously identified large achievement gap between these 2 populations. The results revealed significant differences between the 2…

This study used a quasi-experimental design to examine the effect of being diagnosed with a learning disability on elementary school children's self-esteem. Findings indicated that self-esteem increased significantly above prediagnosis of a learning disability while self-esteem levels in a control group of children without learning disabilities…

A comparison of cognitive, academic, and linguistic profiles for 74 learning-disabled students and 37 nondisabled college students found significant differences in reading, writing, listening, and speaking achievement. No significant differences were found for gender or Verbal-Performance split in cognitive ability. Instruments used showed similar…

Data are presented comparing children with learning disabilities to children with mild mental retardation, and comparing these two groups to normally achieving peers matched for chronological age (ages 6 to 8). Four studies were conducted, involving different types of oddity problems and rhyming skills. Results of the four studies indicated little…