ability.cov | R Documentation |
Ability and Intelligence Tests
Description
Six tests were given to 112 individuals. The covariance matrix is given in this object.
Usage
ability.cov
Details
The tests are described as
- general:
a non-verbal measure of general intelligence using Cattell's culture-fair test.
- picture:
a picture-completion test
- blocks:
block design
- maze:
mazes
- reading:
reading comprehension
- vocab:
vocabulary
Bartholomew gives both covariance and correlation matrices, but these are inconsistent. Neither are in the original paper.
Source
Bartholomew, D. J. (1987). Latent Variable Analysis and Factor Analysis. Griffin.
Bartholomew, D. J. and Knott, M. (1990). Latent Variable Analysis and Factor Analysis. Second Edition, Arnold.
References
Smith, G. A. and Stanley G. (1983).
Clocking g
: relating intelligence and measures of timed
performance.
Intelligence, 7, 353–368.
doi:10.1016/0160-2896(83)90010-7.
Examples
require(stats)
(ability.FA <- factanal(factors = 1, covmat = ability.cov))
update(ability.FA, factors = 2)
## The signs of factors and hence the signs of correlations are
## arbitrary with promax rotation.
update(ability.FA, factors = 2, rotation = "promax")