This study investigated the relationship between mathematics difficulties and psychopathology in a large community sample (N = 881) of youth (8-18 years of age) in the United States. The primary aims of the study were to (a) test the associations between mathematics difficulties and specific components of internalizing, externalizing, attention,…

Despite historical emphasis on "specific" learning disabilities (SLDs), academic skills are strongly correlated across the curriculum. Thus, one can ask how specific SLDs truly are. To answer this question, we used bifactor models to identify variance shared across academic domains (academic "g"), as well as variance unique to…

The current study tested a multiple-cognitive predictor model of word reading, math ability, and attention in a community-based sample of twins ages 8 to 16 years (N = 636). The objective was to identify cognitive predictors unique to each skill domain as well as cognitive predictors shared among skills that could help explain their overlap and…

Although approximately 5-8% of students have a mathematical learning disability (MLD), researchers have yet to develop a consensus operational definition. To examine how MLD has been identified and what mathematics topics have been explored, the authors conducted a systematic review of 165 studies on MLD published between 1974 and 2013. To move…

This study examined whether a large group of postsecondary students participating in a support program for students classified as having learning disabilities (LD) met criteria for five objective diagnostic models for LD: IQ-achievement discrepancy (1.0 SD, 1.5 SD, and greater than 2.0 SD) models, a "Diagnostic and Statistical Manual of…

In view of the high degree of correlation between the two instruments, findings suggest that the utility of the Peabody Individual Achievement Test (PIAT) as a wide-range achievement test is at least as promising as the Wide Range Achievement Test (WRAT) has been. (Author/RC)

The Mathematics subtest of the Peabody Individual Achievement Test is analyzed and its content represented in a format similar to that used in diagnostic math tests. An error analysis matrix is provided and its use is illustrated with application to the mathematics performance of a sixth grade child. The subtest is recommended as a diagnostic test…

Fifteen learning disabled students (six to nine years old) scored significantly higher on the PIAT spelling subtest than on a dictated spelling test using identical words. Either approach, however, (selection or supply) ranked subjects similarly. (Author/CL)

The concurrent validity of the Peabody Individual Achievement Test (PIAT) with 45 learning disabled children (7- to 12-years-old) was investigated using the California Achievement Test (CAT), the Wide Range Achievement Test (WRAT), and teacher ratings as criterion measures. (Author/DB)

The study investigated the concurrent validity of the Peabody Individual Achievement Test (PIAT) with 60 learning disabled adolescents. Findings generally supported the concurrent validity of the PIAT as a measure of academic achievement with secondary learning disabled students. (SBH)

Two validity studies were made of the Peabody Individual Achievement Test (PIAT) with 152 learning disabled and 115 non-learning disabled children (ages from 7 to 10 years). In the first study, Ss' scores on the PIAT, California Achievement Test (CAT), and the Wide Range Achievement Test (WRAT) were correlated; in the second study scores on the…

Results of the present study appear to suggest that the PIAT and WRAT may be used interchangeably to assess the achievement levels of learning disabled children. (Author)

Compared Kaufman Assessment Battery for Children (K-ABC) with Wechsler Intelligence Scale for Children-Revised (WISC-R) and Peabody Individual Achievement Test (PIAT) to determine K-ABC's utility in determination of a severe discrepancy for learning disabilities classification. Found that K-ABC and WISC-R/PIAT approaches to the determination of a…

Learning disabled college students (N=16) were tested to compare the Wide Range Achievement Test (WRAT) with the Peabody Individual Achievement Test (PIAT). Significantly different scores are derived when WRAT norms are compared with PIAT norms, indicating that the tests are not interchangeable instruments for academic achievement. (RC)