Six tests were given to 112 individuals. The covariance matrix is given in this object.
ability.covThe tests are described as
a non-verbal measure of general intelligence using Cattell's culture-fair test.
a picture-completion test
block design
mazes
reading comprehension
vocabulary
Bartholomew gives both covariance and correlation matrices, but these are inconsistent. Neither are in the original paper.
Smith, G. A. and Stanley G. (1983) Clocking \(g\): relating intelligence and measures of timed performance. Intelligence, 7, 353--368.