Previous work has shown that malnutrition has deleterious effects on both IQ and aspects of temperament. It is hypothesized that while malnutrition bears a direct relation to IQ, aspects of temperament are also involved in a mediating role so that they produce indirect associations between malnutrition and IQ. The study examines the association of…

In this article we present factor models to test for ability differentiation. Ability differentiation predicts that the size of IQ subtest correlations decreases as a function of the general intelligence factor. In the Schmid-Leiman decomposition of the second-order factor model, we model differentiation by introducing heteroscedastic residuals,…

This article presents results from two studies that included ethnically and socioeconomically diverse samples totaling 4,462 children in kindergarten through third grade. Each study examined the psychometric properties of a web-based, self-administered battery of assessments of socialemotional comprehension called "SELweb." Assessment…

Recently, Gotham et al. ("2007") proposed revised algorithms for the Autism Diagnostic Observation Schedule (ADOS) with improved diagnostic validity. The aim of the current study was to replicate predictive validity, factor structure, and correlations with age and verbal and nonverbal IQ of the ADOS revised algorithms for Modules 1 and 2…

Eight-seven adult outpatients in Edinburgh (Scotland) were tested with the Wechsler Adult Intelligence Scale--Revised (WAIS-R) and a test of visual inspection time (IT). Factor analysis confirms that IT correlates more strongly with performance than with verbal intelligence quotient (IQ) scores. Implications for the study of IT and mental tests…

This study examined whether a timesharing factor can be identified when a number of competing tasks are presented in the midst of a range of single tests designed to sample a broad range of psychological dimensions. A battery of single and competing tasks was presented to 126 subjects. (Author/LMO)

The construct validity of a supplemental scoring system for the Kaufman Assessment Battery for Children (K-ABC) was evaluated with 146 referred school-age children (aged 6 to 12.5 years) and the K-ABC normative sample. Results support the construct validity of only part of the scoring model. (SLD)

In a study conducted in Ireland, factor analysis of IQ, mathematics, and English standardized test scores, together with the 15 teacher ratings, showed that there is overlap between ratings and test results but that the information obtained is not redundant. (Author/RL)

Objective: To determine the extent to which the Youth Self-Report (YSR) can be used to assess emotional and behavioral problems in adolescents with intellectual disabilities (IDs). Method: In 2003, 281 11- to 18-year-olds with IDs (IQ greater than or equal to 48) completed the YSR in an interview, and in 1993, 1,047 non-ID adolescents completed…

A set of immediate memory-span tests, concept- and rule-learning tasks, and an IQ test were administered to adolescents. A color-form memory factor and IQ substantially predicted rule-learning proficiency. Effects of memory aids appeared to induce conceptual rules and serve as a base for rehearsing information. (Author/RD)

This paper is a brief psychometric review of the Cooperative Preschool Inventory (CPI-R), Revised Edition intended to supplement the review of CPI in the "Seventh Mental Measurements Yearbook." The 1970 revision of the CPI-R is a brief screening test for teacher-administered testing of three-to-six-year-old children. It is intended to…

A pilot study was conducted to ascertain if creative abilities measures could be adapted to the upper elementary school level and maintain their factorial validity. The factorial validities of seven measures of productive thinking abilities at the upper elementary school level were tested across grade levels and different socio-economic…