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Direct linkvan der Sluis, Sophie; Derom, Catherine; Thiery, Evert; Bartels, Meike; Polderman, Tinca J. C.; Verhulst, F. C.; Jacobs, Nele; van Gestel, Sofie; de Geus, Eco J. C.; Dolan, Conor V.; Boomsma, Dorret I.; Posthuma, Danielle – Intelligence, 2008
Sex differences on the Dutch WISC-R were examined in Dutch children (350 boys, 387 girls, age 11-13 years) and Belgian children (370 boys, 391 girls, age 9.5-13 years). Multi-group covariance and means structure analysis was used to establish whether the WISC-R was measurement invariant across sex, and whether sex differences on the level of the…
Descriptors: Foreign Countries, Gender Differences, Preadolescents, Early Adolescents
Webbink, Dinand; Posthuma, Danielle; Boomsma, Dorret I.; de Geus, Eco J. C.; Visscher, Peter M. – Intelligence, 2008
Previous studies based on population cohorts born at least 35 years ago, have reported appreciable childhood cognitive deficits for twins. We compared longitudinal IQ scores from approximately 188,000 singletons and some 6000 twins who went to primary school in the Netherlands from 1994 to 2003. In addition, we used a family-based design in which…
Descriptors: Twins, Intelligence Tests, Intelligence Quotient, Older Adults
Boomsma, Dorret I.; van Beijsterveld, T. C. E. M.; Beem, A. L.; Hoekstra, R. A.; Polderman, T. J. C.; Bartels, M. – Intelligence, 2008
The relation between intelligence and birth order was shown in a recent publication [Bjerkedal, T., Kristensen, P., Skjeret, G. A. & Brevik, J. I. (2007). Intelligence test scores and birth order among young Norwegian men (conscripts) analyzed within and between families. "Intelligence," 35, 503-514] to be negative. Subjects in this…
Descriptors: Intelligence, Twins, Females, Family Size
van der Sluis, Sophie; Posthuma, Danielle; Dolan, Conor V.; de Geus, Eco J. C.; Colom, Roberto; Boomsma, Dorret I. – Intelligence, 2006
Using multi-group covariance and means structure analysis (MG-CMSA), this study investigated whether sex differences were present on the Dutch WAIS-III, and if so, whether these sex differences were attributable to differences in general intelligence ("g"). The sample consisted of 294 females and 228 males between 18 and 46 years old.…
Descriptors: Gender Differences, Foreign Countries, Cognitive Ability, Intelligence
Are Intelligence Tests Measurement Invariant over Time? Investigating the Nature of the Flynn Effect
Wicherts, Jelte M.; Dolan, Conor V.; Hessen, David J.; Oosterveld, Paul; van Baal, G. Caroline M.; Boomsma, Dorret I.; Span, Mark M. – Intelligence, 2004
The gains of scores on standardized intelligence tests (i.e., Flynn effect) have been the subject of extensive debate concerning their nature, causes, and implications. The aim of the present study is to investigate whether five intelligence tests are measurement invariant with respect to cohort. Measurement invariance implies that gains over the…
Descriptors: Intelligence Tests, Aptitude Tests, Factor Analysis, Measurement
Peer reviewedHelms-Lorenz, Michelle; Fons, J. R. Van de Vijer; Poortinga, Ype H. – Intelligence, 2003
Administered two intelligence batteries and a computer-assisted elementary cognitive test battery to 474 second-generation migrant and 747 majority-group students, aged 6 to 12 years, in the Netherlands. Findings suggest that performance differences between these groups are better predicted by a cultural complexity ("c") factor than by…
Descriptors: Cognitive Ability, Cross Cultural Studies, Cultural Differences, Elementary Education
Dolan, Conor V.; Roorda, Willemijn; Wicherts, Jelte M. – Intelligence, 2004
Spearman's hypothesis states that the differences between Blacks and Whites in psychometric IQ are attributable to a fundamental difference in general intelligence ("g"). To investigate this hypothesis, Jensen devised the method of correlated vectors. This method involves calculating the correlation between the factor loadings of the…
Descriptors: Psychometrics, Intelligence Quotient, Intelligence Differences, Hypothesis Testing
te Nijenhuis, Jan; Resing, Wilma; Tolboom, Elsbeth; Bleichrodt, Nico – Intelligence, 2004
The predictive validity and utility of assessment procedures can be increased by adding predictors to the prediction supplied by general ability tests. Of Jensen's early work comes the suggestion of focusing on the cognitive ability short-term memory (STM), especially for low-"g" Black children. Meta-analysis convincingly shows high…
Descriptors: Short Term Memory, Predictor Variables, Academic Achievement, Immigrants
