Performance on Raven's Advanced Progressive Matrices by African, East Indian, and White engineering students in South Africa

Assessing the validity of computer-game-like tests of processing speed and working memory

“…Space Matrix and the Raven's tests had similar patterns of relationships with school subject grades in both samples, and the magnitudes of the correlations between the Raven's tests and school grades were similar to those reported by other researchers (Rushton, Skuy, & Fridjhon, 2003). Although the present samples are too small to form the basis for any strong conclusions, it was encouraging to find that the correlations between school grades and Space Matrix were higher than those between the Raven's tests and every subject except high-school science.…”

General mental ability in South Asians: Data from three Roma (Gypsy) communities in Serbia

“…As a first test of whether Roma/non-Roma differences are more pronounced on the more g loaded items, we carried out Jensen's (1980) method of correlated vectors. To do this, we followed the procedure used by Rushton and Skuy (2000), Rushton, Skuy, and Fridjohn (2002), Rushton, Skuy, and Fridjohn (2003), Rushton, Skuy, and Bons (2004) and correlated the item-total correlations shown in Table 2 (which estimate g), with the standardized differences between Roma and non-Roma in proportion passing each item shown in Table 1 (which estimates the population-group effect size). The correlation between the g loadings and the absolute magnitude of the five sets of Roma/non-Roma differences averaged 0.54 (P b 0.01; Pearson's r) and 0.53 (P b 0.01, Spearman's rho) using the item-total correlations for the Roma group, and 0.59 (P b 0.01; Pearson's r) and 0.55 (P b 0.01, Spearman's rho) using the item-total correlations for all the non-Roma groups.…”

Spearman’s Hypothesis Tested on Black Adults: A Meta-Analysis

“…Te Nijenhuis et al describe how Rushton tested Spearman's hypothesis in a series of studies at the item level using the various versions of Raven's Progressive Matrices (RPM) in Africa and in Serbia [11][12][13][14][15]. The g loadings of items were operationalized as the items' correlation with the total score on the RPM, which has a strong correlation with the general factor of intelligence.…”