Friday, June 20, 2014

Sharing The unitary ability of IQ in the WISC-IV and its computation via BrowZine

The unitary ability of IQ in the WISC-IV and its computation
Orsini, Arturo; Pezzuti, Lina; Hulbert, Sabina
Personality and Individual Differences, Vol. 69 – 2014: 173 - 175


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Monday, June 9, 2014

Assessing the Flynn Effect in the Wechsler scales. [feedly]

Assessing the Flynn Effect in the Wechsler scales.
// Journal of Individual Differences - Vol 31, Iss 2

The current study examined the Flynn Effect (i.e., the increase in IQ scores over time) across all editions of the Wechsler Adult Intelligence Scale (WAIS), Wechsler Intelligence Scale for Children (WISC), and Wechsler Preschool and Primary Scale of Intelligence (WPPSI). By reverse engineering the correlation and scale score transformations from each Wechsler edition's technical manual, we made a mean and covariance matrix using the subtests and age groups that were in common for all editions of a given instrument. The results indicated that when aggregated, there was a FE of 0.44 IQ points/year. This Wechsler instrument used, however, moderates the FE, with the WISC showing the largest FE (0.73 IQ points/year) and the WAIS showing a smallest FE (0.30 IQ points/year). Moreover, this study found that the amount of invariant indicators across instruments and age groups varied substantially, ranging from 51.53% in the WISC for the 7-year-old group to 10.00% in the WPPSI for the 5- and 5.5-year-old age groups. Last, we discuss future direction for FE research based on these results. (PsycINFO Database Record (c) 2014 APA, all rights reserved)

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Kevin McGrew, PhD
Educational Psychologist
Director, Institute for Applied Psychometrics

Saturday, June 7, 2014

Is biculturalism a three dimensional construct?

Interesting article suggesting that biculturalism (and not degree of acculturation and enculturation) may be a three dimensional construct. Click on images to enlarge.