The incremental validity of specific cognitive abilities beyond general intelligence has been investigated in studies using hierarchical multiple regression analyzes (HMR). In the present study, we investigated whether the incremental validity of specific cognitive abilities (i.e., verbal, figural, and numerical ability) for the explanation of…

Teacher-report is commonly used to assess executive functions (EFs) in schools, but teachers' perceptions of EF skills may be biased by students' demographic characteristics. In this short-term longitudinal study, we assessed whether students' gender, ethnicity, and English language learner (ELL) status predicted teachers' reports of students'…

In this paper, we report on the design and implementation of a state of the art Student Information System (SIS) being developed in a moderate size Alberta, Canada school jurisdiction. The SIS design is premised upon transparency, balanced, comprehensive, and multi-method assessments that links qualitative and quantitative data in support of…

Children with academic and behavioral difficulties have been found to report overly positive self-perceptions of performance in their areas of specific deficit. Researchers typically investigate self-perceptions in reference to both actual performance and ratings by teachers, peers, and parents. However, few studies have investigated whether or…

Classical test theory assumes that ability level has no effect on measurement error. Newer test theories, however, argue that the precision of a measurement instrument changes as a function of the examinee's true score. Research has shown that administration errors are common in the Wechsler scales and that subtests requiring subjective scoring…

This study investigated the Wechsler Performance IQ (PIQ) or Perceptual Reasoning Index (PRI)/ Perceptual Organization Index (POI) change over time and its relation to ability levels. PIQ or PRI/ POI was analyzed because of the known sensitivity of nonverbal scales to the Flynn effect. Scores were analyzed using two methods. First, analysis of…

Study identifies most representative ability and achievement for the Linking sample (N=824) of the Wechsler Intelligence Scale for Children-Third Edition (WISC-III) and the Wechsler Individual Achievement Test (WIAT). Primary benefit of core-profile typology is that it provides contrasts for testing multivariate IQ-achievement discrepancies. Two…

Study compares Wechsler (WISC-R) profiles of special-education students to seven core types distinguished primarily by levels of global ability. More than 96% of these students were found to be similar to one of the core types considered to be common variants of normal intellectual ability. Based on data, it is recommended that "no way"…

Examined the assumption that Spearman's law acts unsystematically and approximately uniformly for various subtests of cognitive ability in an IQ test battery when high- and low-ability IQ groups are selected. Data from national standardization samples for Wechsler adult and child IQ tests affirm regularities in Spearman's "Law of Diminishing…

The consistency by which shared abilities are assessed on three intelligence tests was investigated. Instruments under consideration include: the Wechsler Intelligence Scale for Children-Revised, the Kaufman Assessment Battery for Children, and the Stanford-Binet Intelligence Scale-Fourth Edition. A list of shared abilities and the subtests…

Inspection of the factor structure of the Wechsler Intelligence Scale for Children-III for four age groups from the standardization sample indicated a hierarchical arrangement of abilities when both two-factor and four-factor solutions were used. Both solutions indicated a strong general intelligence factor at all age levels studied. (SLD)

A Wherry-Wherry hierarchical factor analysis was performed on the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) subtest intercorrelations for each of six age groups. A hierarchical arrangement of abilities highly congruent with Vernon's structure of intellect theory was obtained. The findings support the construct validity of the…

A study involving 70 grade school children shows that mothers are fairly accurate in estimating their children's abilities (IQ). Accuracy of estimation does not predict achievement or school grades, but mothers' demands of children are related to beliefs about ability and the children's levels of achievement. (SLD)